What kind of wheels are these? (Corvette)?

[Bmanpara]

I have a 1976 Corvette. I have these wheels on the car and know nothing about them. Does anyone know what kind of wheels these are?

http://s887.photobucket.com/albums/ac75/irishemtbb/?action=view&current=Corvette2-Copy.jpg
and what model and year specific