I had the same problem, snapped 2 and stripped 1. (or the other way around?)
I measured the new studs at .480 and the old at .450... you're not going to pull .030. So I drilled out to .465-.470 ? I think it was but didn't install the moroso's and went with a local parts store that carried Doorman studs and picked out 10 at .99 cent each.