Generic bar end mirrors work just fine, you'll just have to remove the bar end and internal weights. Duct tape the bar end to the grip (very firmly), undo the screw with the biggest screwdriver you have, look up a video on removing the internal bar weights on a Honda motorcycle (basically, pull them out with 2 screwdrivers and/or a set or pliers).
They're so much better than stock - no more staring at your elbow and ducking down to get a view.
2014 Fiesta ST
1993 BMW 525i
2003 Honda CBR954RR