I noticed that on my C5 Z06 the front studs are about a quarter inch or so longer than the rear studs. Why is this? Anyway, I got new wheels for it and found that the regular 1.4" lug nuts would not work (they actually broke when the stud popped out the end). I found some White Knight 1907SL lugs that are 1.75" so that would do the trick. I found some at a local wheel/tire shop but this is what they look like:
12X1.5 Bulge Acorn Long Lug Nut 1.75'' Tall 3/4'' Hex 60 Degree Chrome
12X1.5 Bulge Acorn Long Lug Nut 1.75'' Tall 3/4'' Hex 60 Degree Chrome