How to get broken pin out if 8 1/4 chunk?

Not just an 8-1/4 problem or even a "Mopar" problem. I've actually had more problem with that happening on Chevys (well any GM) than anything, at work. And that "5/16 bolt" (really wasn't, besides the wrench size) is actually a "one bolt fits most" as in all of the Big 3 for lots of years) even though the application chart may not tell you so.