Just plug the mirror on the end of handlebar. Will suit handlebar size dia from 15 mm to 22mm. M-WAVE Bicycle handle bar end 3D mirror 1 piece.
CINELLI MILANO ROAD BIKE BICYCLE CYCLE HANDLEBAR ALLOY BAR END PLUGS - Gold
BBB LightStraight Cycle Handlebar Bar Ends Black BBE-17
BBB TrailMonkey Cycle Handlebar Bar Ends Black BBE-01
BBB Classic Cycle Handlebar Bar Ends Black BBE-07
Cycle Handlebar Bar End Plugs / Caps - Black
BBB BBE-01 Trail Monkey Classic Light Straight Bicycle Cycle Bike Bar Ends BLACK
