QUOTE(zymurgist @ Dec 13 2011, 10:05 AM)
Can regular lug bolts be machined down so they have a shoulder for use with Gurneys?
That could work but I would have the wheels machined with a recess for a hardened countersunk washer to match a tapered lug bolt. The washers should be available at your flats along with a tapered lug bolt. The washer will ensure against pulling the tapered lug bolt through the wheel and galling during torque down.
BTW: I love those gurney wheels. I will have a set someday and make this modification whether I get the correct bolt with the wheels or not.
Also I just replaced the studs on Sandy's Ravenna car with bolts fitted to Enkei 92's The studs damaged the threads on one of the front rotors. I ended up having to discard a perfectly good rotor for damaged threads. I'm not a fan of the stud replacments.