You will likely need to find something else. I have a mirror attached to my helmet, which works quite well. You might consider that as an option. Mine is made by Cycle Aware:
http://www.cycleaware.com/index.php?...adhq1epvg0cbe3
These have been re-designed from the old one's that were rather flimsy according to some. They stay put and can easily be moved out of the way when you don't need it.