I need a technical wheel guy. Anybody know what these wheels will fit?

The specs are
Enkei 15" with center caps. 8.5" wide rims with 5 lug 4.75 bolt pattern and 3.5" backspacing.

I got a great deal on tires and rims, but I only bought them for the tires. The seller said they were on a 77 Vette?

Is that correct and will they fit any chevy???

thanks!
Finoke