Does anyone know the part number for either lug cover or lug nut for the 85 IROC wheel. These are metal covers, not plastic. Here is a picture:

This is one of those instances where you ABSOLUTELY DO NOT want to go back to GM for a replacement part. Those crappy pot-metal nuts with the foil covers are EVIL.

Get yourself some good quality aftermarket solid steel ones.

OK. any idea of a replacement that will fit and is black??

They exist. I have a set on my car. They came from somewhere, I just can't remember where; I've had them for 10 or 15 years I guess.

If you look around, they shouldn't be too hard to find.