Hi, I am trying to figure out if these are 0riginal rims or aftermarket; I cant find the center caps, was thinking about getting custom center caps because I think the rims look pretty cool.

Those are aftermarket but I do not know the brand. Is that paint code 638? If so that is the first year they sold a black Z.

I think those are Western Wheels. I don't know the model name. They had a smooth center cap. Here's a picture of a deeper 15" version. Might be tough to find because I don't think they're in business anymore.