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They are different critters, probably not something you'll find local
GM used them on the alum-vette rims and those honeycomb type rims on the trans-ams (not sure about the camaro's using them for anything)
We've got a pretty good tire shop locally and he went through a bunch of catalogs, found some that looked close but had metric threads. Ended up ordering through one of the vette places. (tire guy said their price looked close to what he would have been at anyways)
Maybe you have a local guy with better sources though
Mooser
Here's one(of very many)ebay listings for correct Corvette aluminum wheel lugs. With nice pics! http://www.ebay.com/itm/Chevy-Buick-...item4ab0ebb625
Do a search...."Corvette aluminum wheel lug nuts".
You DON'T want to use the regular steel wheel lugs or the aftermarket "mag" wheel lugs with the long reach shanks.
I sold my slotted wheels and one set of C3 Corvette lug nuts when I switched to BOSS 338's. I have another set of stock aluminum slotted wheel lugnuts somewhere in my garage. I will find them this weekend and post them on the C3 Parts forum.