I am sure TBSpyder and I are referring to the same company, but most of the small local audio shops (including us-although it has been a few years) all use Gulf Fabrics Inc. They also supply most of the OEM automotive materials to the upholstery shops. They will have everything you need. Don't know if it will do any good but you can tell them Matt from MCOR sent you. Here is their info:

Gulf Fabrics Inc.
3709 North Armenia Avenue
Tampa, FL 33607
(813) 875-2707