If you call or email SMS Auto Fabrics in Canby, Oregon, with your trim tag #, they will send you a cool book of samples of everything for your car. I got one and it had carpet, seats, headliner, windlace, door panels, you name it.
I pulled my back seat, out of curiosity. I didn't find any tags, but I did find a stamp on the underside of the vinyl of 09-58. Kinda cool.
Chad