The longer studs are for the back wheels. Moroso doesn't even make a longer stud for the front. The knurl size is something weird. You have to run a small spacer, and you can clearance the bracket with a grinding wheel. I got it to work with one of those $10 spacers from Pep boys. Just make sure you run the correct lug nut. It is something like 1.60" shank, so that you grab as much of the stud with the nut as you can.
Kurt