Another Bandit rider I know spent way too much time, money and effort designing, experimenting with, and finally having these brackets cast. I agreed to buy a set of castings to help defray the cost. He may have one pair left, so if you're interested I'll pass on your contact info (PM me). The brackets are rough cast, so you'll need to sand and polish and paint them.
Note that he has no plans to make more. Also, this is not a simple bolt on mod. It requires some mods to the GXSR mirrors, including drilling a hole in the stem to pass the wire through. And the were NOT cheap. But I'm real happy with the way they turned out.
I also added a module intended for cars, to use the turn signal lights as DRLs:
http://www.webelectricproducts.com/products.htm
This runs the filaments in the turn signals as running lights until I use the turn signal switch, then both the running lights go off, and the selected side blinks normally. I think these running lights, way up high and wide, will really attract attention, especially at night. I commute in suburban DC traffic, so the more visible I am the better.