PIAA Bracket on R1100RT
This shows the approximate position of the bracket. In this photo, the mirror is remove, and I've removed the large screw just inside the hole in the fairing. That large screw is the mounting point for the bracket.
There is a hole near the center of the bracket large enough to clear the mirror mounting stud. Ideally, the stud would be holding the bracket, but getting the studs off requires (at least) removing the dashboard.