Trying to buy a longer set of lug bolts for my Empi Fuchs replica wheels as the rear bolts are too short to be safe. But what seat are these wheels? Ball seat or cone seat? The lugs supplied are cone seat but I'm just making sure. I'm looking at 40 mm length lug bolts.

I think they are cone.
cip1 says their reps are 60* acorn.
Look at the hole, cone (acorn) will have a definite straight taper, where ball (real fuchs) will be roundish taper.

http://www2.cip1.com/SearchResults.asp?Search=4X14ACORN

thanks man, I thought that may be the case as most after market wheels use the acorn 60*.