I'm not 100% percent here, but since no one else has responded, I believe they should be rounded, like an acorn nut. I hope someone can confirm this for sure, as I need some myself.
Yes, they are the rounded acorn style. The originals are stainless capped. Not sure if they reproduce these or if the reproductions are chrome.
I don't think all of the originals were stainless capped, I have what I believe to be original lug nuts on my '68 rallys and they are chrome acorn style, not capped. o No:
Check this thread - do a search on lug nut: http://www.v8buick.com/showthread.php?t=53867&highlight=lug+nut - Bill
Here's what I have on mine, obviously wrong!! They are 1 3/8" tall. Certainly not acorns! Thanks for the help guys!! <a href="http://smg.photobucket.com/albums/v226/jatidaback/71%20Buick%20GS/?action=view¤t=DSCN2731.jpg" target="_blank"><img src="http://img.photobucket.com/albums/v226/jatidaback/71%20Buick%20GS/DSCN2731.jpg" border="0" alt="Photobucket"></a> <a href="http://smg.photobucket.com/albums/v226/jatidaback/71%20Buick%20GS/?action=view¤t=DSCN2732.jpg" target="_blank"><img src="http://img.photobucket.com/albums/v226/jatidaback/71%20Buick%20GS/DSCN2732.jpg" border="0" alt="Photobucket"></a>
If you give me a couple of days I can send a pic of the correct original nuts that I have media blasted and will be sending out to get chrome plated. They are a solid acorn style nut. The common replacements are chrome capped.
My dad recently bought a set of the correct style. He lost them. ou: They will hopfully turn up eventually.
I had to have the pic's taken of the lug nuts by a fellow member and we'll try and upload this pic shortly. I do have the capped nuts on my parts car that has factory rally wheels but I am relatively sure that the ones I have taken the pic of is correct.