only time i saw this was on a crashed 33 where the car had slip sideways into a curb or something, and the mount wasn't really broken just bent, but seriously weakened, could this have happened to yours?
Perhaps it would be best to weld up the mount and then strengthen it with some plates, then its sure never to move.
Perhaps it would be best to weld up the mount and then strengthen it with some plates, then its sure never to move.