Posted for "sqpilot@earthlink" <sqpilot@earthlink.net>:

Hi, Kelly.....I found the core at AutoZone. I went to look at one, and the information in their catalog was incorrect.  The length and width were correct, but the actual core thicknes was not 4 inches. It is 3 inches.  If you would like, I can go back to AutoZone and take a look at their catalog for the part number.  If I recall correctly, the unit fits 2000 and 2001 Chevy light trucks.  Hope this helps.  Paul Conner