Exhibit 21 Subsidiaries of R&B, Inc. Significant Subsidiaries Jurisdiction RB Distribution, Inc. Pennsylvania RB Management, Inc. Pennsylvania Dorman Products of America, Ltd. Kentucky RB Service Supply, L.P. Georgia RBPEACH, Inc. Delaware Cosmos International, Inc. Minnesota Motor Power Industries, Inc. Delaware Scan-Tech Sweden USA/Sweden, A.B. Sweden Allparts, Inc. Delaware Exhibit Page 1