The bolts (not studs) on my carrier were so stripped and worn that I was worried about losing my spare. The bolts I had were just #5 bolts tack welded to the carrier. There's no room to get an angle grinder in there so I used a Dremel and some abrasive cutoff wheels. I also had to use a cold chisel to get the top passenger-side bolt out and make room for the new stud. Then I had to take a step-drill to get the actual studs to seat. The metal on the carrier is not thick/strong enough to get the studs to swage in. I was able to get the old welds off enough to get the new studs in and weld them in place. Worked like a charm. When I can get my antique phone to get the pics onto my laptop, I'll share the pics.