I bought a set of GMC caps from a member here that were brand new in a box. I bought a set of the Chevy bowtie decals that go on the caps from another member. Might have even been the same member but different transaction? That way I could go either way.
Pays to be patient but keep your eyes open.
But you might try LMC. They offer a repop set but they are made from plastic. Personaly I feel thats better anyways. No pitting and if they get in bad shape they were cheap enought to just replace them.
I bought a set for my 4x4 and they still look good today, 4 or so years later.
If they would have offered 2wd caps at the time I would have bought them instead of the OEM ones I mentioned above. If you are going for resto the OEM ones are the ticket. If you just want something that looks good I'd go with the LMC pieces.
Also, when I bought mine, they didn't include the mounting screws or even offer them. I believe they now come with a complete set. And those are a $6.95 item at the dealer - x 12 = ~$84!!!
Here is the LMC page.
If that doesn't work it is page 100 of their online catalog.
When I bought my 4x4 caps I thought they were ~$15 a pair, so $30 for a set of front and rear. Looks like they have went up a bit?
Looks like they have the Aluminum ones too if that is your choice.