EXHIBIT 99.12

                                 August 14, 2003

HSBC Bank USA
452 Fifth Avenue
New York, New York 10018

         RE: Confirmation of Primary Swap Relating to the Class A-1b Notes (HSBC
Ref. 353622HN)

Dear Ladies and Gentlemen:

         The purpose of this letter agreement is to confirm the terms and
conditions of the Swap Transaction (the "Primary Swap") entered into between
HSBC Bank USA (the "Counterparty") and Capital Auto Receivables Asset Trust
2003-3 (the "Trust") as of the Trade Date listed below (the "Transaction"). This
letter constitutes a "Confirmation" as referred to in the Primary ISDA Agreement
specified below.

1.       The definitions and provisions contained in the 2000 ISDA Definitions
         (the "Definitions"), as published by the International Swaps and
         Derivatives Association, Inc. ("ISDA"), are incorporated into this
         Confirmation. In the event of any inconsistency between those
         definitions and provisions and this Confirmation, this Confirmation
         will govern. The parties agree that this transaction is a Transaction
         under the ISDA Master Agreement of the parties dated as of August 14,
         2003. The agreement is comprised of the printed form of such agreement
         as published by ISDA, as supplemented and modified by a Schedule (the
         "Primary ISDA Agreement"). In the event of any inconsistency between
         the provisions set forth in the Schedule and the provisions set forth
         in this Confirmation, this Confirmation shall govern.

         This Confirmation constitutes a binding agreement between you and us
         and will supplement, form a part of, and be subject to the Primary ISDA
         Agreement described above as amended and supplemented from time to
         time.

         The Counterparty and the Trust acknowledge that this Transaction
         relates to the Class A-1b Floating Rate Asset Backed Notes (the "Notes"
         or "Reference Notes") issued by the Trust for value pursuant to and
         subject to the Indenture.

         Capitalized terms used and not otherwise defined herein, in the Primary
         ISDA Agreement or in the Definitions shall have the meanings assigned
         to them in Exhibit A or Exhibit B hereto, as applicable.

         All references to "dollars" or to "$" shall be references to amounts in
         United States Dollars.

2.       The terms of the particular Transaction to which this Confirmation
         relates are as follows:

         Type of Transaction: Interest Rate Swap.

         Notional Amount: $980,000,000 with respect to the initial Calculation
         Period. The Notional Amount with respect to each Calculation Period
         thereafter shall be equal to the Reference Note Balance as of the close
         of business on the Distribution Date at the beginning of the relevant
         Calculation Period (as set forth in the Calculation Statement (defined
         below) delivered by GMAC to the Counterparty on or prior to the
         Determination Date relating to such Calculation Period pursuant to
         Section 3 below). Notwithstanding the foregoing, for purposes of
         determination of a Settlement Amount, the Notional Amount with respect
         to each Calculation Period relating to a Payment Date occurring on or
         after the Early Termination Date (each a "Post-Termination Calculation
         Period") shall be equal to the product of (i) the Scheduled Reference
         Note Balance for the Distribution Date at the beginning of such
         Post-



         Termination Calculation Period and (ii) 1 plus the Average Notional
         Amount Percentage Difference (defined below). For the purpose of the
         foregoing calculation, the Scheduled Reference Note Balance for each
         Distribution Date shall be as set forth on Exhibit B to the
         Back-to-Back Confirmation.

         Trade Date: August 5, 2003.

         Effective Date: August 14, 2003.

         Termination Date: The earlier of the close of business on (i) the Final
         Scheduled Distribution Date, and (ii) the Fixed Rate Payer Payment Date
         on which the Notional Amount is reduced to zero.

         Fixed Amounts:

                  Fixed Rate Payer: The Trust.

                  Fixed Rate Payer Period End Dates: The 15th calendar day of
                  each month, commencing September 15, 2003, to and including
                  the Termination Date, in each case, subject to adjustment in
                  accordance with the Following Business Day Convention.

                  Fixed Rate Payer Payment Date: With respect to each
                  Calculation Period, the day that is one Business Day prior to
                  the first Distribution Date to occur following the last day of
                  such Calculation Period.

                  Fixed Rate: 1.785%.

                  Fixed Rate Day Count Fraction: 30/360.

         Floating Amounts:

                  Floating Rate Payer: The Counterparty.

                  Floating Rate Payer Period End Dates: Each Fixed Rate Payer
                  Period End Date.

                  Floating Rate Payer Payment Dates: Each Fixed Rate Payer
                  Payment Date.

                  Reset Dates: With respect to each Calculation Period, the
                  first day of such Calculation Period.

                  Floating Rate Option: LIBOR (as defined in Exhibit A hereto).

                  Spread: Plus 5 Basis Points.

                  Floating Rate Day Count Fraction: Actual/360.

                  Compounding: Inapplicable.

         Business Days for Payment: New York (New York), Detroit (Michigan) and
         Chicago (Illinois).

         Calculation Agent: The Trust, or General Motors Acceptance Corporation,
         as agent for and on behalf of the Trust.

         Default Rate: For any United States Dollar payments, the rate
         determined under the option entitled "USD Federal Funds - H.15" plus 1%
         using daily Reset Dates. The Default Rate will be applied on

                                       2


         the basis of Compounding as if the overdue amount were a Notional
         Amount and using daily Compounding Dates, and interest will accrue and
         be payable before as well as after judgment.

3.       Calculations and Notifications: On or before each Determination Date,
         the Calculation Agent shall determine the Fixed Amount due to the
         Counterparty on the next succeeding Fixed Rate Payer Payment Date and
         the Floating Amount due to the Trust on the next succeeding Floating
         Rate Payer Payment Date and the Calculation Agent shall notify the
         Counterparty in writing of both (i) the Floating Rate and (ii) the
         amount of such payment.

         In addition, on each Determination Date the Trust shall deliver to the
         Counterparty (by facsimile with hard copy to follow) a statement (the
         "Calculation Statement") setting forth with respect to the close of
         business on the immediately preceding Distribution Date the Reference
         Note Balance as of such Distribution Date.

         The Trust will give the Counterparty prompt written notice of any
         Default under the Indenture.

4.       Credit Downgrade: In the event that the Joint Probability is reduced
         below AA- in the case of S&P or Aa3, in the case of Moody's, the
         Offsetting Counterparty shall promptly notify the Trust (and any
         permitted assignee or transferee of the Trust) and the Counterparty of
         such event and (unless, within thirty (30) days after such reduction,
         the applicable Rating Agency has reconfirmed the ratings of the
         Reference Notes and the Other Securities that were in effect
         immediately prior to such reduction) the Counterparty shall within
         thirty (30) days of receipt of notice of such reduction, with the prior
         written confirmation of the applicable Rating Agency that such
         arrangement will not result in the reduction of the rating of any of
         the Reference Notes or the Other Securities existing immediately prior
         to the reduction of the applicable Joint Probability, either:

                  (1) (x) obtain a substitute swap provider (the
                  "Substitute Swap Provider") acceptable to the Trust
                  (such acceptance not to be unreasonably withheld) and
                  replace this Transaction with a swap transaction on
                  substantially similar terms or with such other
                  amendments as consented to in writing by the Trust
                  (which consent shall not be unreasonably withheld),
                  provided such replacement would result in an S&P
                  Joint Probability of at least AA- and a Moody's Joint
                  Probability of at least Aa3, except that such
                  Substitute Swap Provider shall thenceforth be the
                  "Counterparty" hereunder; or (y) replace, with the
                  consent of the then current Offsetting Counterparty,
                  the swap transaction with the then current Offsetting
                  Counterparty with a swap transaction with a
                  replacement Offsetting Counterparty on terms approved
                  by S&P and Moody's or enter into a swap transaction
                  with another party such that such party shall be
                  acting as an intermediary between the Counterparty
                  and the then current Offsetting Counterparty (such
                  replacement or intermediary being the "Replacement
                  Offsetting Counterparty"); or

                  (2) enter into an ISDA Credit Support Annex with the
                  Trust in the form of a New York law governed ISDA
                  Credit Support Annex (with a Paragraph 13 mutually
                  acceptable to the Trust and the Counterparty, but
                  containing the following terms: (i) Eligible
                  Collateral, Cash and negotiable debt obligations
                  issued by the U.S. Treasury Department having a
                  remaining term to maturity of not more than ten
                  years; (ii) Threshold, with respect to Trust,
                  infinity and with respect to Counterparty, zero;
                  (iii) Minimum Transfer Amount, USD 250,000; and (iv)
                  Valuation Agent, the Calculation Agent) to assure
                  performance by the Counterparty of its obligations
                  under this Transaction; or

                                       3


                  (3) enter into such other credit support arrangements
                  to assure performance by the Counterparty of its
                  obligations under this Transaction.

         Notwithstanding the foregoing, in the event that the Joint Probability
         is reduced below A- in the case of S&P, or A3, in the case of Moody's,
         then the Offsetting Counterparty shall promptly notify the Trust (and
         any permitted assignee or transferee of the Trust) and the Counterparty
         of such event and (unless, within thirty (30) days after such reduction
         the applicable Rating Agency has reconfirmed the ratings of the
         Reference Notes and the Other Securities that were in effect
         immediately prior to such reduction) the Counterparty shall within
         thirty (30) days of receipt of notice of such reduction, with the prior
         written confirmation of the applicable Rating Agency that such
         arrangement will not result in the reduction of the rating of any of
         the Reference Notes or the Other Securities existing immediately prior
         to the reduction of the applicable Joint Probability as a direct result
         of the reduction of such Joint Probability, obtain a Substitute Swap
         Provider acceptable to the Trust (such acceptance not to be
         unreasonably withheld) and replace this Transaction with a swap
         transaction on substantially similar terms or with such other
         amendments as consented to in writing by the Trust (which consent shall
         not be unreasonably withheld) provided such replacement would result in
         an S&P Joint Probability of at least AA- or a Moody's Joint Probability
         of Aa3 except that such Substitute Swap Provider shall thenceforth be
         the "Counterparty" hereunder.

         Upon any replacement of this Transaction with a swap transaction with a
         Substitute Swap Provider, this Transaction shall terminate without any
         payment by either party hereto and any and all collateral posted by the
         Counterparty shall be returned to it within three (3) Business Days and
         any other form of collateral arrangement (including letters of credit,
         surety bond or other guarantee) provided by or on behalf of the
         Counterparty shall terminate.

         In the event that the Counterparty fails to satisfy its obligations set
         forth above in this Section 4, the Trust or any permitted assignee or
         transferee of the Trust shall have the option, exercisable in its
         discretion and with regard to the interests of the Noteholders, within
         ten (10) Business Days following the date of expiry of the thirty (30)
         day period after the date of receipt of notice of the reduction
         (unless, within thirty (30) days of receipt of notice of such
         reduction, the applicable Rating Agency has reconfirmed the rating of
         the Reference Notes that was in effect immediately prior to such
         reduction), to designate (in writing) an Early Termination Date on the
         basis that such failure shall be treated as a Termination Event with
         the Counterparty as the Affected Party. For the avoidance of doubt, the
         Counterparty and the Trust acknowledge and agree that any such failure
         shall not constitute an Event of Default.

5.       Account Details:

                  Payments to Fixed Rate Payer:

                      Bank One, National Association
                      ABA No.: 071000013
                      A/C: No.: 10-43256 further credit to
                                CARAT 2003-3 Collection Account No. 2600132400
                      Attn: Keith Richardson

                  Payments to Floating Rate Payer:

                      HSBC Bank USA
                      MRMDUS33
                      ABA: 021001088
                      Acc: 000049298
                      Favour: DPG
                                       4


                      Attn: George Gammond

6.       Limited Recourse: Notwithstanding anything to the contrary contained
         herein but without limiting the Counterparty's rights under Section
         5(a)(i) of the Primary ISDA Agreement, all of the obligations of the
         Trust shall be payable by the Trust only at the times and to the extent
         of funds available therefor under the Trust Sale and Servicing
         Agreement and, to the extent such funds are not available or are
         insufficient for the payment thereof, shall not constitute a claim
         against the Trust to the extent of such unavailability or insufficiency
         until such time as, and then to the extent that, the Trust has assets
         sufficient to pay such prior deficiency. This paragraph shall survive
         the termination of this Agreement but in all cases shall expire one
         year and one day after the final payment with respect to all notes and
         certificates issued by the Trust.

7.       Limitation of Liability: It is expressly understood and agreed by the
         parties hereto that (a) this Agreement is executed and delivered by
         Deutsche Bank Trust Company Delaware, not individually or personally
         but solely as Owner Trustee of the Trust in the exercise of the powers
         and authority conferred and vested in it, (b) each of the
         representations, undertakings and agreements herein made on the part of
         the Trust is made and intended not as personal representations,
         undertakings and agreements by Deutsche Bank Trust Company Delaware but
         is made and intended for the purpose for binding only the Trust, (c)
         nothing herein contained shall be construed as creating any liability
         on Deutsche Bank Trust Company Delaware, individually or personally, to
         perform any covenant either expressed or implied contained herein, all
         such liability, if any, being expressly waived by the parties hereto
         and by any Person claiming by, through or under the parties hereto and
         (d) under no circumstances shall Deutsche Bank Trust Company Delaware
         be personally liable for the payment of any indebtedness or expenses of
         the Trust or be liable for the breach or failure of any obligation,
         representation, warranty or covenant made or undertaken by the Trust
         under this Agreement or any other related documents.

8.       To the extent that a capitalized term in this Transaction is defined by
         reference to a related definition contained in any Trust Document, for
         purposes of this Transaction only, such capitalized term shall be
         deemed to be amended only if the amendment of the term in a Trust
         Document relating to such capitalized term occurs with the prior
         written consent of the Counterparty.

                                     * * * *

                                       5


         Please confirm that the foregoing correctly sets forth the terms of our
agreement by executing the copy of this Confirmation enclosed for that purpose
and returning it to us.

                                  CAPITAL AUTO RECEIVABLES ASSET
                                  TRUST 2003-3

                                  By: DEUTSCHE BANK TRUST COMPANY
                                      DELAWARE, not in its individual capacity
                                      but solely as Owner Trustee

                                  By:_______________________________________
                                  Name:
                                  Title:

Accepted and confirmed as
of the date first written above:

HSBC BANK USA

By:____________________________
Name:__________________________
Title:_________________________

Acknowledged and agreed as
of the date first written above:

GENERAL MOTORS ACCEPTANCE
CORPORATION,
solely as Calculation Agent

By:________________________________

Name:______________________________

Title:_____________________________

Primary Confirmation of A-1b Interest Rate Swap

                                     A - 1


                                    EXHIBIT A

The following terms shall have the following meanings in this Confirmation:

         "Average Notional Amount Percentage Difference": means, with respect to
each Calculation Period prior to the first Post-Termination Calculation Period,
a fraction, the numerator of which is the sum of the Notional Amount Percentage
Difference for each Calculation Period prior to the first Post-Termination
Calculation Period and the denominator of which is the number of Calculation
Periods prior to the first Post-Termination Calculation Period.

         "Back-to-Back Confirmation": means the Confirmation, dated as of the
date hereof, evidencing the terms of an interest rate swap relating to the
Reference Notes, between GMAC and the Counterparty, which has been or will be
entered into pursuant to the ISDA Master Agreement (including the Schedule
thereto), dated as of June 1, 2000 between GMAC and the Counterparty.

         "Determination Date": the tenth (10th) day of each calendar month, or
if such tenth (10th) day is not a Business Day, the next succeeding Business
Day.

         "Distribution Date": the fifteenth (15th) day of each succeeding
calendar month following the Effective Date or, if such fifteenth (15th) day is
not a Business Day, the next such succeeding Business Day, commencing on the
first day following the Effective Date.

         "Final Scheduled Distribution Date": as defined in Appendix A to the
Trust Sale and Servicing Agreement.

         "Indenture": the Indenture, dated as of the date hereof between the
Trust and the Indenture Trustee, as amended and supplemented from time to time
in accordance with its terms.

         "Indenture Trustee": Bank One, National Association, not in its
individual capacity but solely as trustee under the Indenture, or any successor
trustee under the Indenture.

         "LIBOR": means for any Calculation Period with respect to each Floating
Rate Payer Payment Date, the rate for deposits in U.S. Dollars for a period of
one month which appears on the Telerate Service Page 3750 as of 11:00 a.m.,
London time, on the day that is two LIBOR Business Days prior to the first day
of the Calculation Period preceding such Floating Rate Payer Payment Date (or,
in the case of the initial Floating Rate Payer Payment Date, two LIBOR Business
Days prior to the Effective Date) preceding such Floating Rate Payer Payment
Date. If the rate does not appear on that date on the Telerate Service Page 3750
(or any other page as may replace that page on that service, or if that service
is no longer offered, any other service commonly used in the interbank market
for displaying LIBOR or comparable rates as may be selected by the Indenture
Trustee after consultation with the Seller), then LIBOR will be the Reference
Bank Rate.

         "LIBOR Business Day": any day other than a Saturday, Sunday or any
other day on which banks in London are required or authorized to be closed.

         "Notional Amount Percentage Difference": means, with respect to each
Calculation Period prior to the first Post-Termination Calculation Period, a
fraction, the numerator of which is the difference of (x) the Notional Amount
with respect to such Calculation Period minus (y) the Scheduled Reference Note
Balance for the Distribution Date at the beginning of such Calculation Period
and the denominator of which is such Scheduled Reference Note Balance.

                                     A - 2


         "Other Securities": Class A-2b, Class A-3b, Class A-4b Notes and Class
B-2 Certificates issued by the Trust.

         "Reference Bank Rate": means for any Calculation Period for any
Floating Rate Payer Payment Date, the per annum rate determined on the basis of
the rates at which deposits in U.S. Dollars are offered by the reference banks
(which will be four major banks that are engaged in transactions in the London
interbank market, selected by the Calculation Agent) as of 11:00 a.m., London
time, on the day that is two LIBOR Business Days prior to the first day of the
Calculation Period preceding such Floating Rate Payer Payment Date to prime
banks in the London interbank market for a period of one month, in amounts
approximately equal to the principal amount of the Reference Notes then
outstanding. The Calculation Agent will request the principal London office of
each of the reference banks to provide a quotation of its rate. If at least two
quotations are provided, the rate will be the arithmetic mean of the quotations,
rounded upwards to the nearest one-sixteenth of one percent. If on that date
fewer than two quotations are provided as requested, the rate will be the
arithmetic mean, rounded upwards to the nearest one-sixteenth of one percent, of
the rates quoted by one or more major banks in New York City, selected by the
Calculation Agent, as of 11:00 a.m., New York City time, on that date to leading
European banks for United States dollar deposits for a period of one month in
amounts approximately equal to the principal amount of the Reference Notes then
outstanding. If no quotation can be obtained, then LIBOR will be the rate for
the prior Floating Rate Payer Payment Date.

         "Reference Note Balance": as of the Effective Date, $980,000,000 and,
with respect to each Distribution Date thereafter, the aggregate principal
balance of any and all outstanding Reference Notes

         "Seller": Capital Auto Receivables, Inc., which has executed the Trust
Sale and Servicing Agreement as the Seller, or its successor in interest
pursuant to Section 3.03 of the Trust Sale and Servicing Agreement.

         "Scheduled Reference Note Balance": means, with respect to each
Distribution Date, the scheduled principal balance of the Reference Notes set
forth on Exhibit B to the Back-to-Back Confirmation.

         "Trust Sale and Servicing Agreement": the Trust Sale and Servicing
Agreement, dated as of the date hereof between the Seller, General Motors
Acceptance Corporation, as Servicer, and the Trust, as amended, modified and
supplemented from time to time in accordance with its terms.

                                     A - 3


                                    EXHIBIT B

         "Contingent Party": the Offsetting Counterparty or the Replacement
Offsetting Counterparty, as applicable.

         "Fallback Swap Transaction": the swap transaction entered into by the
Trust and Offsetting Counterparty relating to the Class A-1b Notes.

         "Joint Probability": the Moody's Joint Probability or the S&P Joint
Probability, as applicable.

         "Moody's": Moody's Investors Service, Inc. and its successors.

         "Moody's Joint Probability" means the joint probability determined by
Moody's of the long-term likelihood of payment under this interest rate swap
determined by locating the intersection of the long-term unsecured debt ratings
of the Primary Party and the Contingent Party on the table below headed "Implied
Joint Support Rating for Medium Correlation Case" (except that, for any pairing
other than the initial Primary Party with the initial Contingent Party, the
table below to be used shall be the table headed "Implied Joint Support Rating
for Low Correlation Case" or the table headed "Implied Joint Support Rating for
High Correlation Case" if so specified by Moody's within five days after Moody's
has received notice of a potential pairing of a Primary Party with a Contingent
Party).

             IMPLIED JOINT SUPPORT RATING FOR HIGH CORRELATION CASE



             Rating of the Higher Rated Party
       ----------------------------------------------------------------------------------------------------------
             Aaa   Aa1   Aa2   Aa3   A1    A2    A3   Baa1   Baa2  Baa3  Ba1   Ba2   Ba3   B1    B2    B3   Caa
                                                      
       ----------------------------------------------------------------------------------------------------------
Rating Aaa   Aaa
of     ----------------------------------------------------------------------------------------------------------
the    Aa1   Aaa   Aaa
Lower  ----------------------------------------------------------------------------------------------------------
Rated        Aa2   Aaa   Aaa   Aa1
Party  ----------------------------------------------------------------------------------------------------------
       Aa3   Aaa   Aaa   Aa1   Aa2
       ----------------------------------------------------------------------------------------------------------
       A1    Aaa   Aaa   Aa1   Aa2   Aa3
       ----------------------------------------------------------------------------------------------------------
       A2    Aaa   Aaa   Aa1   Aa2   Aa3   A1
       ----------------------------------------------------------------------------------------------------------
       A3    Aaa   Aaa   Aa1   Aa2   Aa3   A1    A2
       ----------------------------------------------------------------------------------------------------------
       Baa1  Aaa   Aaa   Aa1   Aa2   Aa3   A1    A2   A3
       ----------------------------------------------------------------------------------------------------------
       Baa2  Aaa   Aaa   Aa1   Aa2   Aa3   A1    A2   A3     Baa1
       ----------------------------------------------------------------------------------------------------------
       Baa3  Aaa   Aaa   Aa1   Aa2   Aa3   A1    A2   A3     Baa1  Baa2
       ----------------------------------------------------------------------------------------------------------
       Ba1   Aaa   Aa1   Aa2   Aa3   A1    A2    A3   Baa1   Baa2  Baa3  Ba1
       ----------------------------------------------------------------------------------------------------------
       Ba2   Aaa   Aa1   Aa2   Aa3   A1    A2    A3   Baa1   Baa2  Baa3  Ba1   Ba2
       ----------------------------------------------------------------------------------------------------------
       Ba3   Aaa   Aa1   Aa2   Aa3   A1    A2    A3   Baa1   Baa2  Baa3  Ba1   Ba2   Ba3
       ----------------------------------------------------------------------------------------------------------
       B1    Aaa   Aa1   Aa2   Aa3   A1    A2    A3   Baa1   Baa2  Baa3  Ba1   Ba2   Ba3   B1
       ----------------------------------------------------------------------------------------------------------
       B2    Aaa   Aa1   Aa2   Aa3   A1    A2    A3   Baa1   Baa2  Baa3  Ba1   Ba2   Ba3   B1    B2
       ----------------------------------------------------------------------------------------------------------
       B3    Aaa   Aa1   Aa2   Aa3   A1    A2    A3   Baa1   Baa2  Baa3  Ba1   Ba2   Ba3   B1    B2    B3
       ----------------------------------------------------------------------------------------------------------
       Caa   Aaa   Aa1   Aa2   Aa3   A1    A2    A3   Baa1   Baa2  Baa3  Ba1   Ba2   Ba3   B1    B2    B3   Caa
       ----------------------------------------------------------------------------------------------------------


                                     B - 1


            IMPLIED JOINT SUPPORT RATING FOR MEDIUM CORRELATION CASE



             Rating of the Higher Rated Party
       ------------------------------------------------------------------------------------------------------
             Aaa  Aa1  Aa2   Aa3   A1   A2   A3   Baa1  Baa2  Baa3   Ba1   Ba2   Ba3   B1    B2    B3   Caa
                                                  
       ------------------------------------------------------------------------------------------------------
Rating Aaa   Aaa
of     ------------------------------------------------------------------------------------------------------
the    Aa1   Aaa  Aaa
Lower  ------------------------------------------------------------------------------------------------------
Rated        Aa2  Aaa  Aaa   Aa1
Party  ------------------------------------------------------------------------------------------------------
       Aa3   Aaa  Aaa  Aa1   Aa1
       ------------------------------------------------------------------------------------------------------
       A1    Aaa  Aaa  Aa1   Aa1  Aa1
       ------------------------------------------------------------------------------------------------------
       A2    Aaa  Aaa  Aa1   Aa1  Aa2   Aa2
       ------------------------------------------------------------------------------------------------------
       A3    Aaa  Aaa  Aa1   Aa1  Aa2   Aa2  Aa3
       ------------------------------------------------------------------------------------------------------
       Baa1  Aaa  Aaa  Aa1   Aa1  Aa2   Aa3  A1   A2
       ------------------------------------------------------------------------------------------------------
       Baa2  Aaa  Aaa  Aa1   Aa1  Aa2   Aa3  A1   A2    A3
       ------------------------------------------------------------------------------------------------------
       Baa3  Aaa  Aaa  Aa1   Aa1  Aa2   Aa3  A1   A2    A3    Baa2
       ------------------------------------------------------------------------------------------------------
       Ba1   Aaa  Aa1  Aa1   Aa2  Aa3   A1   A2   A3    Baa1  Baa2   Baa3
       ------------------------------------------------------------------------------------------------------
       Ba2   Aaa  Aa1  Aa1   Aa2  Aa3   A1   A2   A3    Baa1  Baa2   Ba1   Ba1
       ------------------------------------------------------------------------------------------------------
       Ba3   Aaa  Aa1  Aa1   Aa2  Aa3   A1   A2   A3    Baa1  Baa3   Ba1   Ba1   Ba2
       ------------------------------------------------------------------------------------------------------


              IMPLIED JOINT SUPPORT RATING FOR LOW CORRELATION CASE



             Rating of the Higher Rated Party
        ---------------------------------------------------------------------------------------------------------
             Aaa   Aa1  Aa2   Aa3  A1    A2   A3    Baa1  Baa2   Baa3   Ba1   Ba2    Ba3  B1    B2   B3    Caa
                                                     
        ---------------------------------------------------------------------------------------------------------
Rating  Aaa  Aaa
of      ---------------------------------------------------------------------------------------------------------
the     Aa1  Aaa   Aaa
Lower   ---------------------------------------------------------------------------------------------------------
Rated   Aa2  Aaa   Aaa  Aaa
Party   ---------------------------------------------------------------------------------------------------------
        Aa3  Aaa   Aaa  Aaa   Aaa
        ---------------------------------------------------------------------------------------------------------
        A1   Aaa   Aaa  Aaa   Aaa  Aaa
        ---------------------------------------------------------------------------------------------------------
        A2   Aaa   Aaa  Aaa   Aaa  Aaa   Aa1
        ---------------------------------------------------------------------------------------------------------
        A3   Aaa   Aaa  Aaa   Aaa  Aaa   Aa1  Aa2
        ---------------------------------------------------------------------------------------------------------
        Baa1 Aaa   Aaa  Aaa   Aaa  Aaa   Aa1  Aa3   Aa3
        ---------------------------------------------------------------------------------------------------------
        Baa2 Aaa   Aaa  Aaa   Aaa  Aaa   Aa1  Aa3   A1    A1
        ---------------------------------------------------------------------------------------------------------
        Baa3 Aaa   Aaa  Aaa   Aaa  Aa1   Aa1  Aa3   A1    A1     Baa1
        ---------------------------------------------------------------------------------------------------------
        Ba1  Aaa   Aaa  Aaa   Aa1  Aa1   Aa2  A1    A1    A2     Baa1   Baa3
        ---------------------------------------------------------------------------------------------------------
        Ba2  Aaa   Aaa  Aa1   Aa1  Aa1   Aa2  A1    A1    A2     Baa2   Baa3  Ba1
        ---------------------------------------------------------------------------------------------------------
        Ba3  Aaa   Aaa  Aa1   Aa1  Aa2   Aa3  A1    A2    A3     Baa2   Baa3  Ba1    Ba2
        ---------------------------------------------------------------------------------------------------------
        B1   Aaa   Aa1  Aa1   Aa2  Aa3   Aa3  A1    A3    Baa1   Baa2   Ba1   Ba1    Ba2  Ba3
        ---------------------------------------------------------------------------------------------------------
        B2   Aaa   Aa1  Aa2   Aa2  Aa3   A1   A2    A3    Baa1   Baa3   Ba1   Ba1    Ba3  Ba3   B1
        ---------------------------------------------------------------------------------------------------------
        B3   Aaa   Aa1  Aa2   Aa3  A1    A1   A3    Baa1  Baa2   Baa3   Ba1   Ba2    Ba3  B1    B1   B3
        ---------------------------------------------------------------------------------------------------------
        Caa  Aaa   Aa1  Aa2   Aa3  A1    A2   A3    Baa1  Baa2   Baa3   Ba1   Ba2    Ba3  B1    B2   B3    Caa
        ---------------------------------------------------------------------------------------------------------


Notwithstanding the foregoing, in the event that under the Triparty Agreement
the Offsetting Counterparty has acceded to the rights of the Counterparty and no
swap transaction has been effected with an additional contingent counterparty or
replacement swap counterparty under the circumstances contemplated by Section

                                     B - 2


2.02 of the Triparty Agreement, then the term "Moody's Joint Probability" shall
refer to the Offsetting Counterparty's long term senior unsecured credit rating
assigned by Moody's (and, for avoidance of doubt, the obligations of the
Counterparty specified in Section 4 of this Confirmation shall constitute
obligations of the Offsetting Counterparty).

         "Offsetting Counterparty" means General Motors Acceptance Corporation
or any successor thereto ("GMAC") under the Fallback Swap Transactions entered
into between the Trust and GMAC.

         "Primary Party": the Counterparty, unless a Substitute Swap Provider
has been obtained, in which case it shall be the Substitute Swap Provider or, if
applicable, a guarantor thereof.

         "Rating Agency": each of S&P and Moody's.

         "S&P": Standard & Poor's Ratings Services and its successors.

         "S&P Joint Probability" means the joint probability determined by S&P
of the long-term likelihood of payment under the interest rate swap determined
by locating the intersection of the Counterparty's long term senior unsecured
debt rating and the Offsetting Counterparty's long-term senior unsecured debt
rating in the following table:

                          IMPLIED JOINT SUPPORT RATING



PRIMARY PARTY
- --------------------------------------------------------------------------------
CONTINGENT
   PARTY           AAA   AA+   AA    AA-   A+    A     A-   BBB+   BBB    BBB-
                                         
- --------------------------------------------------------------------------------
            AAA    AAA   AAA   AAA   AAA   AAA   AAA   AAA  AAA    AAA    AAA
- --------------------------------------------------------------------------------
            AA+    AAA   AAA   AAA   AAA   AAA   AAA   AAA  AAA    AAA    AAA
- --------------------------------------------------------------------------------
            AA     AAA   AAA   AAA   AAA   AAA   AAA   AAA  AA+    AA+    AA+
- --------------------------------------------------------------------------------
            AA-    AAA   AAA   AAA   AA+   AA+   AA+   AA+  AA+    AA+    AA
- --------------------------------------------------------------------------------
            A+     AAA   AAA   AAA   AA+   AA+   AA+   AA+  AA     AA     AA-
- --------------------------------------------------------------------------------
            A      AAA   AAA   AAA   AA+   AA+   AA    AA   AA-    AA-    A+
- --------------------------------------------------------------------------------
            A-     AAA   AAA   AAA   AA+   AA+   AA    AA-  A+     A+     A
- --------------------------------------------------------------------------------
            BBB+   AAA   AAA   AA+   AA+   AA    AA-   A+   A      A      A-
- --------------------------------------------------------------------------------
            BBB    AAA   AAA   AA+   AA+   AA    AA-   A+   A      A-     BBB+
- --------------------------------------------------------------------------------
            BBB-   AAA   AAA   AA+   AA    AA-   A+    A    A-     BBB+   BBB
- --------------------------------------------------------------------------------


Notwithstanding the foregoing, (i) in the event that the long-term senior
unsecured debt rating of either the Primary Party or the Contingent Party is
rated below BBB- by S&P, then the S&P Joint Probability shall be the higher of
the then current long-term senior unsecured debt rating of the Primary Party and
the Contingent Party and (ii) in the event that under the Triparty Agreement the
Offsetting Counterparty has acceded to the rights of the Counterparty and no
swap transaction has been effected with an additional contingent counterparty or
replacement swap counterparty under the circumstances contemplated by Section
2.02 of the Triparty Agreement, then the term "S&P Joint Probability" shall
refer to the Offsetting Counterparty's long-term senior unsecured credit rating
assigned by S&P (and, for the avoidance of doubt, the obligations of the
Counterparty specified in Section 4 of this Confirmation shall constitute
obligations of the Offsetting Counterparty).

         "Triparty Agreement": the Triparty Contingent Assignment Agreement
dated as of the Effective Date among the Trust, the Offsetting Counterparty and
the Counterparty.

                                     B - 3