----see post #2 -----I have been the go-to guy at work for broke bolts, and not break bolts, once I used the tig weld a washer to broke piece---pop it out, if t doesn't come out first time it does the second, it works so good that now t's easier to break them off instead of taking the time for repeated heating,trying,trying but not breaking it off ----
the position of rear stud makes it hard to drill, it's hard to keep a right angle drill or adapter ,and shortened drill exactly straight----and it will be harder to helicoil or thread insert if drilling gets screwed up ---using 'vinces method" leaves the original threads good
even if you have to tow it to get it done