I don't remember who the manufacturer was. I am sorry I can't be more helpful. Although the wheel pictured in this thread appears to have the oversize center hole.

thanks again

The Wheel Vintiques series 62 wheel definitely has the oversize center hole.

You should be able to find plenty of GM OE 15x7 wheels w/ 4.25 backspace if you are patient, as they came on 70s monte carlos and also 77-90 Caprices with the optional suspension (F41?). I have one spare from a ~73-74 Monte Carlo, but one wheel won't do you much good.

Wheel Vintiques are lug-centric wheels and many have had vibration issues using them because they are never truly centered. I was told that Ricks or Year One has some repro wheels that are hub-centric and believe Newstagia Wheel also reps a line with hub-centric rims. Might be worth looking into or you could have some balancing issues and vibration.

Original rims would obviously be hub-centric but I'd have them trued up if running slicks. Hope that helps.

years ago I ran stock 15-8 corvette rallies with a set of 28"tall by 12" wide M&h racemasters. my outer lips are rolled. but they fit easily.

Yes 15X8 rallys or 15X7 rally's work fine!