I've been trying to find out if my rims are factory or not. I've seen others like them, but I don't see these rims in any of the specification lists. Here is a picture of them. I've seen reference to Corvette rims and aluminum alloy turban.

 

That was an optional wheel for the 1978-79 models, made by Western Wheels for GM. They were available on the Berlinetta (14x7) and the Z28 (15x7). Check out the link, and scroll to the bottom:
http://www.camarosource.ca/php/camar...eels&year=1979

 

Those are option code YJ8 Turbines.