I broke one shortly after going to after market rims too. I blamed it on not getting everything seated correctly causing some side loading on the studs. Replacement is pretty easy with normal hand tools. Remove the caliper, slide the disc off, punch out the broken stud. To install the new one, insert the stud from behind the wheel, slide several washers on the stud, install one of the original lug nut on backwards (bevel facing out) then tighten the lug nut to seat the stud. I think the studs are less than five bucks a piece at the dealer. Takes about an hour. If you've had some replaced before the caliper should come off pretty easily. If this is the first time, some muscle will be needed. I check lug torque once a month and do occasionlly find a few have loosened. Oh yea bend up a coat hanger to hang the caliper on before you take it off, it's kinda heavy.
2002 Chevy 2500HD LS D/A CC SB 4X4 Summit White Med. Gray Leather, Stretch Tailgate Extender, Kodiak Sidewinder Retracting Steps, PowerGate tailgate lock, Line-X under rail, Lucerix X-Mount Mirrors, American Racing Pythons 16X8 Chrome, Michlein LTx 285 75R 16\'s, Rancho 4.5", Fumoto, Valentine 1