You'll probably need to send a sample (maybe 2x2 inches) to them. When I did my '63, there was some confusion over the "salt & pepper" that's occasionally stated as correct for the early Bs. Mine was a solid color. I think ACC has the widest color availability.
Bill Overcash on the board has a '62 and might be able to help you. He had some brown/maroon '62 door panels I bought from him a while back, and may recall the carpet in that car.
Mosher's may be able to help, too.
Sorry no definitive answer, that's part of the "charm" on these cars, but at least it's a bump.