AMENDMENT TO THE RECEIVABLES SALE AGREEMENT

                                                                   
EXHIBIT 10.4

                                                                
EXECUTION COPY

                                    AMENDMENT dated as of April 1,
2005 (this
                           "Amendment") to the RECEIVABLES SALE
AGREEMENT, dated
                           as of November 30, 2004 (the
"Agreement"), by and
                           among each of the Sellers listed on the
signature
                           pages thereto (each, a "Seller"),
AFFINIA GROUP INC.,
                           a Delaware Corporation ("Affinia Group")
in its
                           capacity as agent for the Sellers
thereunder (in such
                           capacity, the "Seller Agent", and
together with the
                           Sellers, the "Seller Parties") and
AFFINIA
                           RECEIVABLES LLC, a Delaware limited
liability company
                           ("Finance Subsidiary").

                  In consideration of the mutual agreements herein
contained and
other good and valuable consideration, the sufficiency and receipt
of which are
hereby acknowledged, the parties hereto hereby agree as follows:

                  SECTION 1. DEFINED TERMS. Capitalized terms used
but not
otherwise defined herein will have the meanings as defined in the
Agreement.

                  SECTION 2. AMENDMENTS TO DEFINITIONS. The
definition of Net
Worth set forth in Schedule A to the Agreement is hereby amended in
its entirety
to read as follows:

                  "Net W