Steering wheel centers that have both correct wood grain and more importantly, correct silver mylar trim and NOT just grey paint. This may also include the gauge bezels as well as they are supposed to be silver trimmed but the repros I have seen simply use grey paint.
Another item that comes to mind are wheel well moldings. The NOS stuff is insane in price (that is if you can even find them) and the repro stuff just plain does not fit properly and looks horrible and breaks too easily. If you have the correct tooling, these things can't be that expensive to make per piece but would sell for a good sum. I had to pay over $400 for a decent set, had to put together a full set by dealing with two sellers and still only have three new ones that had the packaging trashed and the items scratched to heck, but at least were new and could be polished out and the fourth one is a used OE part that needs cleaning and buffing. The sad thing is, I was happy to pay this money and go through the trouble to get these items as the alternative was repro (which isn't really an option), or not have them at all. I bought a NOS set from Ricks back in 2002 and paid $150 for a complete set of 4 GM ones brand new. Those days are gone.
I am sure the list can be extensive and I find it amazing that after over 40 years of technology and know how, we still can not produce car parts as well as they did in the 60's.
