rear motor mount stud question

[roccit_53 at scirocco.cs.uoguelph.ca (C Boyko)]

This is the son's Rabbit, but it would be the same as a Rocco. Fasteners
are not co-operating around here it seems.
Anyway, he managed to detach one of the rear motor mount studs from the
body, not sure why/how, but has anyone fixed this sort of thing? It's like
a black hole for proper detachment around here. The car has a 2L  16V in
it, and he plans to have it make pretty serious power at some point, so it
needs the motor mounted securely, what's the best course of action?

Thanks, the fun just never ends, I think we do more old VW repairs in a
week than an average dealer sees in a month, most of them actually go
pretty well....

Cathy, for Adam
99 New Beetle (missing exhaust)
87 16V (the golden girl, till she explodes)
87 Jetta on bags
90 Jetta "now with less hornets"
88 Cabby "perma-alternator" edition
79 Rocco "now with GM parts"
88 F150
03 Protege 5 "cooned front end"
81 Rabbit "with free swinging motor"
and four parts cars
and four parts cars