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Paul - My drums and front rotors are wide five from AC Industries. They used 12mm stud bolts. The studs I initially bought are 12mm x 12mm 1.50 and overall length 2.25". The 1.50 is the thread pitch. In otherwords they are threaded and simply screw into the drum and rotor. I just don't like the look as they stick out from the nuts quite a bit. Hope this answered your question. Here's a picture:
http://www.c2racers.com/servlet/the-Wheels-cln-Wheel-Studs-and--Nuts/Categories
On the Drag Beetle, the techs like to see long studs, open lugs, and around an inch of thread past the lug nut. We deep threaded them into the drums and hit the protruding threads with with the welder. More to provide a "head" to prevent the stud from ever backing out, than really expecting the weld to hold steel and cast iron together for any length of time.

They're still in place and working just fine.
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