Exhibit 10.50.1Execution CopyAMENDMENT     AMENDMENT, dated as of August 3, 2006 (this “Amendment”), to the CREDIT AGREEMENTdated as of June 30, 2006 (as amended, supplemented or modified from time to time, the “CreditAgreement”) among CSK AUTO, INC., the Lenders party thereto, and JPMORGAN CHASE BANK, N.A., asAdministrative Agent., and LEHMAN COMMERCIAL PAPER INC. and WACHOVIA BANK, NATIONAL ASSOCIATION, asCo-Syndication Agents.WITNESSETH :          WHEREAS, the Company, the Administrative Agent, the Co-Syndication Agents and the Lenders areparties to the Credit Agreement;          WHEREAS, the parties hereto have agreed to amend the Credit Agreement upon the terms andconditions set forth herein;          NOW, THEREFORE, for valuable consideration, the receipt and sufficiency of which are herebyacknowledged, and in consideration of the premises contained herein, the parties hereto agree asfollows:          1. Defined Terms. Unless otherwise defined herein, capitalized terms which aredefined in the Credit Agreement are used herein as defined therein.          2. Amendments. The Credit Agreement is hereby amended to reflect the changes shown as“redlined” on the changed pages to the Credit Agreement attached hereto as Exhibit A.          3. Conditions to Effectiveness of this Amendment. This Amendment shall becomeeffective upon receipt by the Administrative Agent of counterparts of this Amendment duly executedby the Company, the Administrative Agent and the Required Lenders.          4. Continuing Effect. Except as expressly set forth in this Amendment, all of theterms and provisions of the Credit Documents are and shall remain in full force and effect and theCompany shall continue to be bound by all of such terms and provisions.          5. Counterparts. This Amendment may be executed by one or more of the parties to thisAmendment on any number of separate counterparts (including by telecopy), and all of saidcounterparts taken together shall be deemed to constitute one and the same instrument. A set ofthe copies of this Amendment signed by the parties hereto shall be delivered to the Company and theAdministrative Agent. The execution and delivery of this Amendment by any Lender, or by theAdministrative Agent with the consent of any Lender, shall be binding upon such Lender’s successorsand assigns (including transferees of its commitments and Loans in whole or in part prior toeffectiveness hereof) and binding in respect of all of its commitments and Loans, including anyacquired subsequent to its execution and delivery hereof and prior to the effectiveness hereof.          6. GOVERNING LAW. THIS AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES UNDERTHIS AMENDMENT SHALL BE GOVERNED BY,
 

 
          AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.* * * * *
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     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be executed and deliveredby their respective duly authorized officers as of the date first above written.         CSK AUTO, INC.           By /s/ Stephen J. Lewis Name: Stephen J. Lewis      Title: V.P. Treasurer   
 

 
         JPMORGAN CHASE BANK, N.A. as Administrative Agent anda Lender           By: /s/ Teri Streusand       Name: Teri Streusand    Title:   Vice President  
 

 
         WACHOVIA BANK, NATIONAL ASSOCIATION     By: /s/ L. Richard DiDonato       Name: L. Richard DiDonato      Title:   Managing Director  
 

 
         LEHMAN COMMERCIAL PAPER INC.           By: /s/ Laurie B. Perper Name: Laurie B. Perper      Title:   Authorized Signatory   
 

 
EXHIBIT A