Hi Steve,
I use mostly handlebar end mirrors and the fitting you have selected is by far the best, just don't tighten it too hard or the throttle will stick on the bar, DAMHIK. You might like to look at the four sided mirror rather than the round, the 4 sided one gives you a much wider field of view behind, from immediately behind out to the overtaking lane just behind out to lane three 400 yards back.
Furry