I have fitted mine just under the front seat, left hand side, on my 1200GSA. There is a welded strengther seam at the point where two chassis rails meet and this has two small holes in it. They match the holes on the supplied bracket so it was a simple matter of using tie wraps to secure the holder to the frame. I then wired the USB socket up to an unswitched output on my fusebox which is mounted in the tool tray and voila, I can charge my G4 etc whenever I'm travelling away with engine off. Nice, easy, elegant solution and better than using seperate charging sockets IMHO.