Well, gang, I am about to go out and refit the lower alternator bracket on
my 85 Westy.   I never was able to remove the stud on the right side.  (You
will recall, they were both broken off, but I was able to remove the one on
the left.)  Since I have no reason to believe that these bolts weren't
broken off when I acquired the vehicle, I'm going to chance it by mounting
the alternator with just one bolt on the bottom bracket and the one bolt on
the upper bracket.

Don't know how I can get the other one out without dropping the engine, and
I'm not really equipped to do this.

I'll watch it like a hawk and hope for the best.

Dave in KC
85 Westy
http://members.fortunecity.com/davebaker1

....and for a picture of the sheared studs, see

http://members.fortunecity.com/davebaker1/westy/id27.htm