1
 
                             LETTER OF TRANSMITTAL
 
                        TO TENDER SHARES OF COMMON STOCK
                (INCLUDING ANY ASSOCIATED STOCK PURCHASE RIGHTS)
 
                                       OF
 
                         GUARANTY NATIONAL CORPORATION
 
                       PURSUANT TO THE OFFER TO PURCHASE
                             DATED NOVEMBER 5, 1997
 
                                       BY
 
                           ORION CAPITAL CORPORATION
 
                 THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT
       12:00 MIDNIGHT, NEW YORK CITY TIME, ON THURSDAY, DECEMBER 4, 1997,
                         UNLESS THE OFFER IS EXTENDED.
 
                    To: State Street Bank and Trust Company
                                    Depositary:
 

                                                                
            By Mail:                     By Overnight Courier:                    By Hand:
   State Street Bank and Trust        State Street Bank and Trust     Securities Transfer and Reporting
             Company                            Company                        Services, Inc.
    Corporate Reorganization           Corporate Reorganization           Corporate Reorganization
         P. O. Box 9061                   70 Campanelli Drive                 1 Exchange Plaza
      Boston, MA 02205-8686               Braintree, MA 02184              55 Broadway, 3rd Floor
                                                                             New York, NY 10006

 
                      Facsimile Transmission Copy Number:
                                 (617) 794-6333
 
                            Confirm by Facsimile to:
                                 (617) 794-6388
 
                     Shareholder Inquiries: 1-800-426-5523
 
  DELIVERY OF THIS LETTER OF TRANSMITTAL TO AN ADDRESS OTHER THAN AS SET FORTH
ABOVE, OR TRANSMISSION OF INSTRUCTIONS VIA A FACSIMILE NUMBER OTHER THAN THE ONE
              LISTED ABOVE, WILL NOT CONSTITUTE A VALID DELIVERY.
 
     This Letter of Transmittal is to be completed by stockholders either if
certificates for Shares (as defined in the Offer to Purchase dated November 5,
1997 (the "Offer to Purchase")) are to be forwarded herewith or, unless an
Agent's Message (as defined in the Offer to Purchase) is utilized, if tenders
are to be made by book-entry transfer to the account maintained by the
Depositary at The Depository Trust Company or The Philadelphia Depository Trust
Company (each, a "Book-Entry Transfer Facility") pursuant to the procedures set
forth in Section 3 of the Offer to Purchase. Stockholders who tender Shares by
book-entry transfer are referred to herein as "Book Entry Stockholders" and
other stockholders are referred to herein as "Certificate Stockholders."
Stockholders whose certificates are not immediately available or who cannot
deliver their certificates (or who cannot comply with the book-entry transfer
procedures on a timely basis) and all other documents required hereby to the
Depositary at or prior to the Expiration Date (as defined in the Offer to
Purchase) may tender their Shares according to the guaranteed delivery procedure
set forth in Section 3 of the Offer to Purchase. See Instruction 2. DELIVERY OF
DOCUMENTS TO A BOOK-ENTRY TRANSFER FACILITY DOES NOT CONSTITUTE A DELIVERY TO
THE DEPOSITARY.
   2
 
[ ] CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER
    MADE TO THE ACCOUNT MAINTAINED BY THE DEPOSITARY WITH A BOOK-ENTRY TRANSFER
    FACILITY AND COMPLETE THE FOLLOWING:
 
       Name of Tendering Institution
       -------------------------------------------------------------------------
       Check Box of Applicable Book-Entry Transfer Facility:
 
            [ ] The Depository Trust Company
 
            [ ] The Philadelphia Depository Trust Company
 
       Account Number
       -------------------------------------------------------------------------
       Transaction Code Number
       -------------------------------------------------------------------------
 
[ ] CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED PURSUANT TO A NOTICE OF
    GUARANTEED DELIVERY PREVIOUSLY SENT TO THE DEPOSITARY AND COMPLETE THE
    FOLLOWING:
 
       Name(s) of Registered Holder(s)
       -------------------------------------------------------------------------
 
       Date of Execution of Notice of Guaranteed Delivery
            --------------------------------------------------------------------
 
       Name of Institution which Guarantees Delivery
       -------------------------------------------------------------------------
 
                          SPECIAL TENDER INSTRUCTIONS
- --------------------------------------------------------------------------------
                         DESCRIPTION OF SHARES TENDERED
 

                                                                                                    
- ------------------------------------------------------------------------------------------------------------------------------
             NAME(S) AND ADDRESS(ES) OF REGISTERED HOLDER(S)                            CERTIFICATE(S) TENDERED
                       (PLEASE FILL IN, IF BLANK)                           (ATTACH ADDITIONAL SIGNED SCHEDULE IF NECESSARY)
- ------------------------------------------------------------------------------------------------------------------------------
                                                                                              TOTAL NUMBER
                                                                                               OF SHARES         NUMBER OF
                                                                            CERTIFICATE      REPRESENTED BY        SHARES
                                                                             NUMBER(S)      CERTIFICATE(S)*      TENDERED**
                                                                         ------------------------------------------------------
 
                                                                         ------------------------------------------------------
 
                                                                         ------------------------------------------------------
 
                                                                         ------------------------------------------------------
 
                                                                         ------------------------------------------------------
 
                                                                         ------------------------------------------------------
                                                                            Total Shares
- ------------------------------------------------------------------------------------------------------------------------------
  * Need not be completed by Book-Entry Stockholders.
 ** Unless otherwise indicated, it will be assumed that all Shares evidenced by any certificate delivered to the Depositary are
    being tendered. See Instruction 4.

 
- --------------------------------------------------------------------------------
   3
 
                    NOTE: SIGNATURES MUST BE PROVIDED BELOW
              PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY
 
LADIES AND GENTLEMEN:
 
     The undersigned hereby tenders to Orion Capital Corporation, a Delaware
corporation ("Orion"), the above-described shares of Common Stock, par value
$1.00 per share (the "Shares"), of Guaranty National Corporation, a Colorado
corporation (the "Company"), together with the associated Rights, in accordance
with the offer to purchase any and all of the outstanding Shares at a price of
$36.00 per Share, net to the seller in cash, without interest, upon the terms
and subject to the conditions set forth in the Offer to Purchase, as it may be
amended or supplemented from time to time, and this Letter of Transmittal (which
together constitute the "Offer"), receipt of which is hereby acknowledged.
Unless the context otherwise requires, all references to Shares shall include
the associated Rights and all references to the Rights shall include all
benefits that may inure to the holders of the Rights pursuant to the Rights
Agreement. The undersigned understands that Orion reserves the right to transfer
or assign, in whole or from time to time in part, to one or more of its
affiliates, the right to purchase Shares tendered pursuant to the Offer.
Capitalized terms not defined herein shall have the meanings attributed to them
in the Offer to Purchase.
 
     The undersigned hereby irrevocably appoints W. Marston Becker and Michael
P. Maloney and each of them, the attorneys-in-fact and proxies of the
undersigned, each with full power of substitution, to vote in such manner as
each such attorney and proxy or his or her substitute shall, in his or her sole
discretion, deem proper, and otherwise act (including pursuant to written
consent) with respect to all of the Shares tendered hereby (and Distributions as
defined below) which have been accepted for payment by Orion prior to the time
of such vote or action and which the undersigned is entitled to vote at any
meeting of stockholders of Guaranty (whether annual or special and whether or
not an adjourned meeting), or by written consent in lieu of such meeting, or
otherwise. This power of attorney and proxy is coupled with an interest in
Guaranty and in the Shares and is irrevocable and is granted in consideration
of, and is effective upon, the acceptance for payment of such Shares by Orion in
accordance with the terms of the Offer. Such acceptance for payment shall
revoke, without further action, any other power of attorney or proxy granted by
the undersigned at any time with respect to such Shares (and Distributions) and
no subsequent powers of attorney or proxies will be given (and if given will be
deemed not to be effective) with respect thereto by the undersigned. The
undersigned understands that Orion reserves the right to require that, in order
for Shares to be deemed validly tendered, immediately upon Orion's acceptance
for payment of such Shares, Orion is able to exercise full voting rights with
respect to such Shares and other securities, including voting at any meeting of
stockholders.
 
     Subject to, and effective upon, acceptance for payment of, and payment for
the Shares tendered herewith in accordance with the terms of the Offer, as the
same may be extended or amended, the undersigned hereby sells, assigns and
transfers to or upon the order of Orion, all right, title and interest in and to
all of the Shares that are being tendered hereby or orders the registration of
such Shares delivered by book-entry transfer, and any and all other Shares or
other securities or rights issued or issuable in respect of such Shares on or
after October 31, 1997 and any or all dividends thereon or distributions with
respect thereto (collectively, "Distributions"), and hereby irrevocably
constitutes and appoints the Depositary the true and lawful agent and
attorney-in-fact of the undersigned with respect to such Shares (and all
Distributions), and any such other Shares, securities or rights (and all
Distributions), with full power of substitution (such power of attorney being
deemed to be an irrevocable power coupled with an interest), to (a) deliver
certificates for such Shares, or any such other Shares (and all Distributions),
securities or rights, or transfer ownership of such Shares (and all
Distributions) on the account books maintained by a Book-Entry Transfer
Facility, together, in any such case, with all accompanying evidences of
transfer and authenticity to or upon the order of Orion, (b) present such
Shares, or any such other Shares, securities or rights, for transfer on
Guaranty's books, and (c) receive all benefits and otherwise exercise all rights
of beneficial ownership of such Shares, or any such other Shares, securities or
rights, all in accordance with the terms of the Offer.
 
     Notwithstanding anything to the contrary herein, no deduction from the
purchase price of $36.00 per Share pursuant to the Offer will be made with
respect to any regular dividend not in excess of $.125 per Share which may be
declared by the Board of Directors of Guaranty to stockholders of record on any
date prior to March 31, 1998.
   4
 
     The undersigned hereby represents and warrants that the undersigned has
full power and authority to tender, sell, assign and transfer the tendered
Shares and any and all other Shares or other securities (and Distributions) or
rights at any time issued or issuable in respect of such Shares and that when
the same are accepted by Orion, Orion will acquire good, marketable and
unencumbered title thereto, free and clear of all liens, restrictions, claims
and encumbrances and the same will not be subject to any adverse claim. The
undersigned will, upon request, execute and deliver any additional documents
deemed by the Depositary or Orion to be necessary or desirable to complete the
sale, assignment and transfer of the tendered Shares and any and all other
Shares or other securities or rights at any time issued or issuable in respect
thereof. In addition, the undersigned shall promptly remit and transfer to the
Depositary for the account of Orion any and all other Shares or other securities
or rights issued to the undersigned on or after October 31, 1997 in respect of
the Shares tendered hereby, accompanied by appropriate documentation of
transfer, and, pending such remittance or appropriate assurances thereof, Orion
shall be entitled to all rights and privileges as owner of any such Shares or
other securities or rights and may withhold the entire purchase price or deduct
from the purchase price the amount or value thereof, as determined by Orion, in
its sole discretion.
 
     No authority herein conferred or agreed to be conferred shall be affected
by, and all such authority shall survive, the death or incapacity of the
undersigned. All obligations of the undersigned hereunder shall be binding upon
the heirs, personal representatives, successors and assigns of the undersigned.
Except as otherwise stated in the Offer to Purchase, this tender is irrevocable.
 
     The undersigned understands that tenders of Shares pursuant to any one of
the procedures described in Section 3 of the Offer to Purchase and in the
instructions hereto will constitute the undersigned's acceptance of the terms
and conditions of the Offer. Orion's acceptance of such Shares for payment will
constitute a binding agreement between the undersigned and Orion upon the terms
and subject to the conditions of the Offer, including, without limitation, the
undersigned's representation and warranty that the undersigned owns the Shares
being tendered.
 
     Unless otherwise indicated herein in the box entitled "Special Payment
Instructions," please issue the check for the purchase price of all Shares
purchased, and return all Share Certificates evidencing Shares not purchased or
not tendered, in the name(s) of the registered holder(s) appearing above under
"Description of Shares Tendered." Similarly, unless otherwise indicated in the
box entitled "Special Delivery Instructions," please mail the check for the
purchase price of all Shares purchased and all Share Certificates evidencing
Shares not tendered or not purchased (and accompanying documents, as
appropriate) to the address(es) of the registered holder(s) appearing above
under "Description of Shares Tendered." In the event that the boxes entitled
"Special Payment Instructions" and "Special Delivery Instructions" are both
completed, please issue the check for the purchase price of all Shares purchased
and return all Share Certificates evidencing Shares not purchased or not
tendered in the name(s) of, and mail such check and Certificates to, the
person(s) so indicated. Stockholders tendering Shares by book-entry transfer may
request that any Shares not accepted for payment be returned by crediting such
account maintained at such Book-Entry Transfer Facility as such stockholder may
designate by making an appropriate entry under "Special Payment Instructions."
The undersigned recognizes that Orion has no obligation, pursuant to the Special
Payment Instructions, to transfer any Shares from the name of the registered
holder(s) hereof if Orion does not purchase any of the Shares tendered hereby.
   5
 
          ------------------------------------------------------------
 
                          SPECIAL PAYMENT INSTRUCTIONS
                        (SEE INSTRUCTIONS 1, 5, 6 AND 7)
 
        To be completed ONLY if the check for the purchase price of Shares
   purchased or Share Certificates evidencing Shares not tendered or not
   purchased are to be issued in the name of someone other than the
   undersigned or if Shares tendered by book-entry transfer which are not
   purchased are to be returned by credit to an account maintained at a
   Book-Entry Transfer Facility other than that designated on the front
   cover.
 
   Issue:  [ ] Check  [ ] Share Certificate (s) to:
 
   Name:
   ----------------------------------------------------
                                        (PRINT)
 
                                                                     Address:
                            -------------------------------------------------
 
          ------------------------------------------------------------
                                   (ZIP CODE)
 
          ------------------------------------------------------------
                           TAXPAYER IDENTIFICATION OR
                             SOCIAL SECURITY NUMBER
 
   [ ]  Credit unpurchased Shares tendered by book-entry transfer to the
        Book-Entry Transfer Facility account set forth below:
                          [ ]  DTC          [ ]  PDTC
 
   ------------------------------------------------------------
                                (Account Number)
 
                   (See Substitute Form W-9 on reverse side)
          ============================================================
 
                         SPECIAL DELIVERY INSTRUCTIONS
                        (SEE INSTRUCTIONS 1, 5, 6 AND 7)
 
        To be completed ONLY if the check for the purchase price of Shares
   purchased or Share Certificates evidencing Shares not tendered or not
   purchased are to be mailed to someone other than the undersigned, or to
   the undersigned at an address other than that shown under "Description of
   Shares Tendered."
 
   Deliver:  [ ] Check  [ ] Share Certificate (s) to:
 
   Name:
   ----------------------------------------------------
                                        (PRINT)
 
                                                                     Address:
                            -------------------------------------------------
 
          ------------------------------------------------------------
                                   (ZIP CODE)
 
          ------------------------------------------------------------
   6
 
- --------------------------------------------------------------------------------
                                   IMPORTANT
 
                            SHAREHOLDERS:  SIGN HERE
              (ALSO COMPLETE SUBSTITUTE FORM W-9 INCLUDED HEREIN)
 
            --------------------------------------------------------
 
            --------------------------------------------------------
                           SIGNATURE(S) OF HOLDER(S)
 
            Dated:
            --------------------------------------------------- ,
            1997
 
                 (Must be signed by registered holder(s) exactly as
            name(s) appear(s) on Share Certificates or on a security
            position listing or by a person(s) authorized to become
            registered holder(s) by certificates and documents
            transmitted herewith. If signature is by a trustee,
            executor, administrator, guardian, attorney-in-fact,
            officer of a corporation or other person acting in a
            fiduciary or representative capacity, please provide the
            following information. See Instruction 5.)
 
            Name(s):------------------------------------------------
 
            --------------------------------------------------------
                                 (PLEASE PRINT)
 
            Capacity (Full Title)
                            ----------------------------------------
 
            Address
                  --------------------------------------------------
 
            --------------------------------------------------------
                               (INCLUDE ZIP CODE)
 
            Area Code and Telephone No.:
                                  ----------------------------------
 
            Taxpayer Identification or Social Security No.:
                                           -------------------------
                   (SEE SUBSTITUTE FORM W-9 INCLUDED HEREIN)
 
                           GUARANTEE OF SIGNATURE(S)
                   (IF REQUIRED -- SEE INSTRUCTIONS 1 AND 5)
 
            Authorized Signature:
                            ----------------------------------------
 
            Name (Please print):
                            ----------------------------------------
 
            Name of Firm:
                       ---------------------------------------------
 
            Address:
                  --------------------------------------------------
 
            --------------------------------------------------------
                               (INCLUDE ZIP CODE)
 
            Area Code and Telephone Number:
                                     -------------------------------
 
            Dated: __________________________________, 1997
 
            FOR USE BY FINANCIAL INSTITUTIONS ONLY. PLACE MEDALLION
            GUARANTEE IN SPACE BELOW.
- --------------------------------------------------------------------------------
   7
 
                                  INSTRUCTIONS
 
             FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER
 
     1. Guarantee of Signatures.  Certificates need not be endorsed and stock
powers and signature guarantees are unnecessary unless (a) a certificate is
registered in a name other than that of the person surrendering the certificate,
or (b) such registered holder (which term for purposes of this document, shall
include any participant in a Book-Entry Facility whose name appears on a
security position listing as the owner of the Shares) completes the Special
Payment Instructions or Special Delivery Instructions. In the case of (a) above,
such certificates must be duly endorsed or accompanied by a properly executed
stock power, with the endorsement or signature on the stock power and on the
Letter of Transmittal guaranteed by a firm which is a member of a registered
national securities exchange or of the National Association of Securities
Dealers, Inc. or a financial institution (including most banks, savings and loan
associations and brokerage houses) that is a member of the Securities Transfer
Association's approved medallion program (such as STAMP, SEMP, or MSP) (an
"Eligible Institution"), unless surrendered for the account of such Eligible
Institution. In the case of (b) above, the signature on the Letter of
Transmittal must be similarly guaranteed. See Instruction 5.
 
     2. Delivery of Letter of Transmittal and Certificates or Book-Entry
Confirmations.  This Letter of Transmittal is to be completed by stockholders
either if certificates are to be forwarded herewith or if tenders are to be made
pursuant to the procedures for delivery by book-entry transfer set forth in
Section 3 of the Offer to Purchase. Certificates for all physically delivered
Shares, or confirmation of any book-entry transfer into the Depositary's account
at a Book-Entry Transfer Facility of Shares delivered by book-entry transfer, as
well as a properly completed and duly executed Letter of Transmittal (or
facsimile thereof or, in the case of a book-entry delivery, an Agent's Message),
with any required signature guarantees and any other documents required by this
Letter of Transmittal, must be received by the Depositary at one of its
addresses set forth on the front side hereof prior to the Expiration Date (as
defined in the Offer to Purchase) or the tendering stockholder must comply with
the procedures referred to in the next sentence. Stockholders whose certificates
are not immediately available or who cannot deliver their certificates and all
other required documents to the Depositary prior to the Expiration Date may
tender their Shares by properly completing and duly executing the Notice of
Guaranteed Delivery pursuant to the guaranteed delivery procedure set forth in
Section 3 of the Offer to Purchase. Pursuant to such procedure (i) such tender
must be made by or through an Eligible Institution, (ii) a properly completed
and duly executed Notice of Guaranteed Delivery substantially in the form
provided by Orion must be received by the Depositary prior to the Expiration
Date and (iii) the share certificates for all tendered Shares, in proper form
for transfer (or confirmation of any book-entry transfer into the Depositary's
account at a Book-Entry Transfer Facility of Shares delivered by book-entry
transfer), together with this Letter of Transmittal (or facsimile thereof or, in
the case of a book-entry delivery, an Agent's Message), properly completed and
duly executed, and any other documents required by this Letter of Transmittal,
must be received by the Depositary within three New York Stock Exchange trading
days after the date of execution of such Notice of Guaranteed Delivery, all as
provided in Section 3 of the Offer to Purchase. The Notice of Guaranteed
Delivery must be delivered by hand to the Depositary or transmitted by telegram,
facsimile transmission or mail and must include a guarantee of an Eligible
Institution in the form set forth on the Notice of Guaranteed Delivery.
 
     THE METHOD OF DELIVERY OF SHARES AND ANY OTHER REQUIRED DOCUMENTS IS AT THE
ELECTION AND RISK OF THE TENDERING STOCKHOLDER. IF CERTIFICATES FOR SHARES ARE
SENT BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY INSURED,
IS RECOMMENDED.
 
     No alternative, conditional or contingent tenders will be accepted and no
fractional Shares will be purchased. All tendering stockholders, by execution of
this Letter of Transmittal (or facsimile hereof), waive any right to receive any
notice of the acceptance of their Shares for payment.
 
     3. Inadequate Space.  If the space provided herein is inadequate, the
certificate numbers and/or the number of Shares should be listed on a separate
schedule attached hereto and separately signed on each page thereof in the same
manner as this Letter of Transmittal is signed.
 
     4. Partial Tenders.  (Applicable to Certificate Stockholders only). If
fewer than all the Shares evidenced by any certificate submitted are to be
tendered, fill in the number of Shares which are to be tendered in the box
entitled "Number of Shares Tendered." In such case, new certificate(s) for the
remainder of the Shares that were evidenced by the old certificate(s) will be
issued and sent to the registered holder, unless otherwise provided in the
appropriate box on this Letter of Transmittal, as soon as practicable after the
expiration of the Offer. All Shares represented by certificates delivered to the
Depositary will be deemed to have been tendered unless otherwise indicated.
 
     5. Signatures on Letter of Transmittal, Stock Powers and Endorsements.  If
this Letter of Transmittal is signed by the registered holder of the Shares
tendered hereby, the signature must correspond with the name as written on the
face of the certificate(s) without alteration, enlargement or any change
whatsoever.
 
     If any of the Shares tendered hereby are owned of record by two or more
joint owners, all such owners must sign this Letter of Transmittal.
   8
 
     If any of the Shares tendered hereby are registered in different names on
several certificates, it will be necessary to complete, sign and submit as many
separate Letters of Transmittal as there are different registrations of
certificates.
 
     If this Letter of Transmittal or any certificates or stock powers are
signed by trustees, executors, administrators, guardians, attorneys-in-fact,
officers of corporations or others acting in a fiduciary or representative
capacity, such persons should so indicate when signing, and proper evidence
satisfactory to Orion of their authority so to act must be submitted.
 
     When this Letter of Transmittal is signed by the registered owner(s) of the
Shares listed and transmitted hereby, no endorsements of certificates or
separate stock powers are required unless payment is to be made, or certificates
for Shares not tendered or purchased are to be issued, to a person other than
the registered owner(s). Signatures on such certificates or stock powers must be
guaranteed by an Eligible Institution.
 
     If this Letter of Transmittal is signed by a person other than the
registered owner(s) of the certificates listed, the certificates must be
endorsed or accompanied by appropriate stock powers, in either case signed
exactly as the name or names of the registered owner or owners appear on the
certificates. Signatures on such certificates or stock powers must be guaranteed
by an Eligible Institution.
 
     6. Stock Transfer Taxes.  Except as set forth in this Instruction 6, no
stock transfer tax stamps or funds to cover such stamps need accompany this
instrument. Any such transfer taxes applicable to the transfer and sale to Orion
pursuant to the Offer will be paid by or on behalf of Orion. If, however,
payment of the purchase price is to be made to, or certificates for Shares not
tendered or purchased are to be registered in the name of, any person other than
the person(s) signing this Letter of Transmittal, the amount of any stock
transfer taxes (whether imposed on the registered holder or such person) payable
on account of the transfer to such person will be deducted from the purchase
price unless satisfactory evidence of payment of such taxes or exemption
therefrom is submitted.
 
     7. Special Payment and Delivery Instructions.  If a check is to be issued
in the name of, and/or certificates for unpurchased Shares are to be issued to,
a person other than the signer of this Letter of Transmittal or if a check is to
be sent and/or such certificates are to be returned to someone other than the
signer of this Letter of Transmittal, or to an address other than that shown
above, the appropriate boxes on this Letter of Transmittal should be completed.
Stockholders tendering Shares by book-entry transfer (i.e., Book-Entry
Stockholders) may request that Shares not purchased be credited to such account
maintained at such Book-Entry Transfer Facility as such Book-Entry Stockholder
may designate hereon. If no such instructions are given, such Shares not
purchased will be returned by crediting the account at the Book-Entry Transfer
Facility designated above. See Instruction 1.
 
     8. Substitute Form W-9.  Each tendering stockholder is required to provide
the Depositary with a correct Taxpayer Identification Number ("TIN") on
Substitute Form W-9, which is provided under "Important Tax Information" below
and to indicate that the stockholder is not subject to backup withholding by
checking the box in Part 2 of the form. Failure to provide the information on
the form may subject the tendering stockholder to 31% federal income tax
withholding on the payment of the purchase price. The box in Part 3 of the form
may be checked if the tendering stockholder has not been issued a TIN and has
applied for a number or intends to apply for a number in the near future. If the
box in Part 3 is checked and the Depositary is not provided with a TIN within 60
days, the Depositary will withhold 31% on all payments of the purchase price
thereafter until a TIN is provided to the Depositary.
 
     9. Requests for Assistance or Additional Copies.  Requests for assistance
or additional copies of the Offer to Purchase, this Letter of Transmittal, the
Notice of Guaranteed Delivery and the Guidelines for Certification of Taxpayer
Identification Number on Substitute Form W-9 may be directed to the Information
Agent or the Dealer Manager at their addresses set forth below.
 
     10. Waiver of Conditions.  The conditions of the Offer may be waived by
Orion, in whole or in part, at any time in its sole discretion in the case of
any Shares tendered.
 
     11. Lost, Destroyed or Stolen Certificates. If any certificate(s)
representing Shares has been lost, destroyed or stolen, the stockholder should
promptly notify the Depositary. The stockholder will then be instructed as to
the steps that must be taken in order to replace the certificates(s). This
Letter of Transmittal and related documents cannot be processed until the
procedures for replacing lost or destroyed certificates have been followed.
 
     IMPORTANT: THIS LETTER OF TRANSMITTAL OR A FACSIMILE COPY HEREOF (TOGETHER
WITH CERTIFICATES FOR SHARES OR CONFIRMATION OF BOOK-ENTRY TRANSFER AND ALL
OTHER REQUIRED DOCUMENTS) MUST BE RECEIVED BY THE DEPOSITARY, OR THE NOTICE OF
GUARANTEED DELIVERY MUST BE RECEIVED BY THE DEPOSITARY, PRIOR TO THE EXPIRATION
DATE (AS DEFINED IN THE OFFER TO PURCHASE).
   9
 
                           IMPORTANT TAX INFORMATION
 
     Under U.S. Federal income tax law, a stockholder whose tendered Shares are
accepted for payment is required to provide the Depositary with such
stockholder's correct TIN on Substitute Form W-9 below. If such stockholder is
an individual, the TIN is his social security number. If the Depositary is not
provided with the correct TIN, the stockholder may be subject to a $50 penalty
imposed by the Internal Revenue Service. In addition, payments that are made to
such stockholder with respect to Shares purchased pursuant to the Offer may be
subject to backup withholding.
 
     Certain stockholders (including, among others, all corporations and certain
foreign individuals) are not subject to these backup withholding and reporting
requirements. In order for a foreign individual to qualify as an exempt
recipient, that stockholder must submit a statement, signed under penalties of
perjury, attesting to that individual's exempt status. Such statements can be
obtained from the Depositary. See the enclosed Guidelines for Certification of
Taxpayer Identification Number on Substitute Form W-9 for additional
instructions.
 
     If backup withholding applies, the Depositary is required to withhold 31%
of all payments made to the stockholder. Backup withholding is not an additional
tax. Rather, the tax liability of persons subject to backup withholding will be
reduced by the amount of tax withheld. If withholding results in an overpayment
of taxes, a refund may be obtained.
 
PURPOSE OF SUBSTITUTE FORM W-9
 
     To prevent backup withholding on payments that are made to a stockholder
with respect to Shares purchased pursuant to the Offer, the stockholder is
required to notify the Depositary of his correct TIN by completing the form
below certifying that the TIN provided on Substitute Form W-9 is correct (or
that such stockholder is awaiting a TIN) and that (1) the stockholder has not
been notified by the Internal Revenue Service that he is subject to backup
withholding as a result of a failure to report all interest or dividends or (2)
the Internal Revenue Service has notified the stockholder that he is no longer
subject to backup withholding.
 
     The box in Part 3 of the Substitute Form W-9 may be checked if the
tendering stockholder has not been issued a TIN and has applied for a TIN or
intends to apply for a TIN in the near future. If the box in Part 3 is checked,
the stockholder or other payee must also complete the Certificate of Awaiting
Taxpayer Identification Number below in order to avoid backup withholding.
Notwithstanding that the box in Part 3 is checked and the Certificate of
Awaiting Taxpayer Identification Number is completed, the Depositary will
withhold 31% of all payments made prior to the time a properly certified TIN is
provided to the Depositary.
 
WHAT NUMBER TO GIVE THE DEPOSITARY
 
     The stockholder is required to give the Depositary the social security
number or employer identification number of the record owner of the Shares. If
the Shares are registered in more than one name or are not registered in the
name of the actual owner, consult the enclosed Guidelines for Certification of
Taxpayer Identification Number on Substitute Form W-9 for additional guidance on
which number to report.
   10
 
                 TO BE COMPLETED BY ALL TENDERING STOCKHOLDERS
                              (SEE INSTRUCTION 8)
 

                                                                  
- --------------------------------------------------------------------------------
PAYER'S NAME: STATE STREET BANK AND TRUST COMPANY
- ---------------------------------------------------------------------------------------------------------
                                 PART 1--PLEASE PROVIDE YOUR TIN IN THE Social Security Number or
                                 BOX AT RIGHT AND CERTIFY BY SIGNING    Employer ID Number
                                 AND DATING BELOW.                      ------------------------------
                                 ------------------------------------------------------------------------
                                  PART 2--CERTIFICATIONS--Under penalties of perjury, I certify that:
                                  (1) The number shown on this form is my correct Taxpayer Identification
                                  Number (or I am waiting for a number to be issued to me and have
                                      checked the box in Part 3) and
                                  (2) I am not subject to backup withholding because: (a) I am exempt
                                  from backup withholding, or (b) I have not been notified by the
                                      Internal Revenue Service (the "IRS") that I am subject to backup
                                      withholding as a result of a failure to report all interest or
                                      dividends, or (c) the IRS has notified me that I am no longer
                                      subject to backup withholding.
                                  CERTIFICATION INSTRUCTIONS--You must cross out item (2) above if you
                                  have been notified by the IRS that you are currently subject to backup
                                  withholding because of underreporting interest or dividends on your tax
                                  return. However, if after being notified by the IRS that you were
                                  subject to backup withholding you received another notification from
                                  the IRS that you are no longer subject to backup withholding, do not
                                  cross out such item (2).
                                 ------------------------------------------------------------------------
                                 PART 3
                                 SIGNATURE  __________________________  DATE  ______________    Awaiting
                                 TIN  [ ]
- ---------------------------------------------------------------------------------------------------------

 
NOTE: FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP WITHHOLDING
      OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE OFFER. PLEASE REVIEW
      THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
      NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.
 
               YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU
              CHECKED THE BOX IN PART 3 OF THE SUBSTITUTE FORM W-9
 
             CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
 
I certify under penalties of perjury that a taxpayer identification number has
not been issued to me, and either (1) I have mailed or delivered an application
to receive a taxpayer identification number to the appropriate Internal Revenue
Service Center or Social Security Administration Office or (2) I intend to mail
or deliver an application in the near future. I understand that if I do not
provide a taxpayer identification number by the time of payment, 31% of all
reportable payments made to me will be withheld, but that such amounts will be
refunded to me if I then provide a Taxpayer Identification Number within sixty
(60) days.
 
Signature:  Date:
- -------------------
 SUBSTITUTE
 FORM W-9
 DEPARTMENT OF THE TREASURY
 INTERNAL REVENUE SERVICE
 PAYER'S REQUEST FOR TAXPAYER
 IDENTIFICATION NUMBER ("TIN")
   11
 
                    THE INFORMATION AGENT FOR THE OFFER IS:
                             D.F. KING & CO., INC.
                                77 Water Street
                            New York, New York 10005
                          Call Collect: (212) 269-5550
                         CALL TOLL FREE (800) 290-6429
 
                      THE DEALER MANAGER FOR THE OFFER IS:
                          DONALDSON, LUFKIN & JENRETTE
                             SECURITIES CORPORATION
                                277 Park Avenue
                            New York, New York 10172
                         (212) 892-7700 (Call Collect)