Have a 80 442. Had a 79 Hurst Olds wish I still had. Those wheels I know are rare - but only need lugs nuts. I know they are kind of odd. Does anyone out there know if other models used that type of nut or a vendor that sells that kind? Not much luck on Ebay. Don't even know what they are called other than I know the thread dimension. But the shank obviously has to go into the wheel just right.
Thanks for anyones help. Cory

 

The lug nuts are quite common and used on a number of GM cars with aluminum wheels. Original P/N is 371674. Search for that. Corvettes use them, so they are everywhere.

 

I believe I got some in the pic-a-part from a Trans Am with the Snowflake wheels. Check GMs with alum rims..

 

There's a 3.2 set on ebay right now for 120 bucks or so. NOS GM. I say 3.2 because there's only 16 lug nuts in the listing. 4 short of a whole set.