Nos lug nuts
 

What wheels do these GM lug nuts go on

The web shows:
5.813 Mag Rally Sport SS Wheel Capped Lug Nuts GM # 414188 Replaces9780732, 9789086, 399683, 1231722. THISIS LISTED FOR THE FOLLOWING APPLICATIONS: 1969-79
Chevy Olds Pontiac Rally wheel

If the 1st design 414188 with HIGH CROWN was ever reproduced , and the price
was say $100 / set of twenty.....any opinion on how many owners of 69-70 High
Quality cars would buy , besides myself ??????

I’m sure I speak for a lot of people when I express my own undying hatred towards those “capped” lug nuts. My father hated them too & it’s mind-boggling to see what NO$ sets bring. I am a Machinist by trade & I tend to make my own lug nuts when I don’t like current offerings for my rare Magnesium wheels. Anyway, how cool would it be to manufacture a 1-piece stainless steel lug nut that is absolutely identical in every aspect to a capped nut? Those POS capped nuts are so easily damaged and show distortion after just a few R&R’s so matter careful a person is. That would be a total non-issue with a good SS nut.

Would stainless be as strong as steel ? Safe ?

ARP has a Stainless 300 material for fasteners. Its tensile & yield is slightly weaker than CM but still higher than a Grade 8 bolt.

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GM parts book show that part number 1231722 was switched in July 1974 over to 414188.

That lug nut in the original post looks like it has a rounded head or am I seeing things?

Heres what they look like
 

I have 4 boxes of 5

Call them booby nuts. I wouldn’t want them on my car.