I've seen picturesof the BEA/PG pad side by side with an NOS 1971 pad and the grain was almost if-not dead on. I believe the later A-body pads 76 and some years prior have a different grain than the earlier ones. The comparison pics were posted on Moparts. I try to find the link.
BEA says they are in the works on a 68 A-body pad. That is supposed to be the very next pad they are going to do.
I don't think there is a hard plastic repro. It's actually like a solid rubber cast resin piece. They don't fit well to the metal dash frame either. With those you can see small air bubbles in the surface.