I've got some Pontiac Rally II wheels (according to the stamping from 1977) which are going on my 1967 Cutlass, I think I need "acorn style" lugs? Is there any threading size I need to worry about or is that standard?
Here is what I am thinking of getting:
https://www.inlinetube.com/products/...UaAvQNEALw_wcB

 

Your 67 uses 7/16"-20 wheel studs. The taper is standard on GM steel wheels of that vintage. Those lug nuts will work fine.