When I removed the alternator bracket from my old 1.9 to transfer it to
the 2.1, I found that it has a long crack in it.  It runs from the left
side edge across (and above) the left stud hole and over to the right
stud hole.  I've never had a problem with this bracket in use and the
studs in the engine aren't affected.

I then went to a tired old spare 1.9 engine and removed it's bracket.
Yep, you guessed it, cracked in virtually the same place.  It's engine
studs are still good, too.

No wonder there are so many posts about failed alternator brackets.

Mike