You could always cast your own.... I've been wanting to cast those same covers using the scrap styrene and lacquer thinner mix technique in a clay mold... Don't know if it will work or not, but it won't hurt to try.....
Here you go... This kit definitely has the houndstooth decals for the custom interior seating which are different from any of the coupe kits... Both interior tubs are different also... The decal sheet from the actual Pace Car kit have the orange houndstooth decals...