PNC Bank, National Association One PNC Plaza 249 Fifth Avenue Pittsburgh, Pennsylvania ###-###-#### November 24, 2004

Exhibit 10.18

PNC Bank, National Association

One PNC Plaza

249 Fifth Avenue

Pittsburgh, Pennsylvania ###-###-####

November 24, 2004

Worthington Receivables Corporation

1205 Dearborn Drive

Columbus, Ohio 43085

Attention: Randal I. Rombeiro

Ladies and Gentlemen:

Reference is hereby made to that Receivables Purchase Agreement, dated as of November 30, 2000 (as amended, amended and restated, or otherwise modified from time to time, the “Agreement”), among each of the undersigned hereto. Terms used herein and not defined herein shall have the meanings set forth in the Agreement.

As you have requested pursuant to Section 1.10 of the Agreement, we hereby agree to extend the Facility Termination Date to November 23, 2005. Accordingly, clause (a) of the definition of “Facility Termination Date” as set forth in Exhibit I to the Agreement is hereby amended by replacing the date “November 24, 2004” with the date “November 23, 2005” therein.

If the foregoing is acceptable to you, please execute the enclosed copies of this letter and return them to the undersigned. Your execution of this letter shall constitute your representation and warranty that all necessary corporate action has been taken to extend the Facility Termination Date contemplated hereby. This letter may be executed in counterparts and shall be effective following our receipt of the fully executed counterpart hereto and once the Seventh Amendment to the Market Street Funding Corporation Liquidity Asset Purchase Agreement and the Third Amendment to the Liberty Street Funding Corp. Liquidity Asset Purchase Agreement become effective.

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IN WITNESS WHEREOF, the parties have executed this letter as of the date first written above.