Busted wheel studs

I have some of those thick unilug wahers to use when drawing the studs in with a impact. Once in a while you'll find the splined portion of the stud comes through the flange slightly. The left hand studs on front end are swedged into the drum and bearing hub. If those are all good and not spinning in the holes I would replace the broken ones on the rear with left hand and keep left on the left, right on the right OEM plan.
Any time I go to get a flat fixed or whatever, I make sure to tell the workers, left hand threads on the left side. IF some kid should say "we dont have a left hand impact" drive away, go somewhere else.
Good luck