Adapter for an 8mm bar end. This was designed for a driven D-Axis bar end mirror. Fitted for a 2015 Kawasaki Z1000 but may work on other make/models. You will need 4 washers and 2 shaft collars for the mirror to clamp onto, these are easily found at your local hardware store. Remove set screw from shaft collar.

Shaft collars can be found here:
http://www.mcmaster.com/#9946k14/=w3yk38
OD=7/8
Shaft=7/16
Width=7/16

Washers are here:
http://www.mcmaster.com/#standard-washers/=w3ykyk
Screw size=M8
OD=16mm
ID=8.4mm

Bottom piece needs supports, top does not. Printed at 2mm in ABS.

UPDATE: Replace model for bottom piece. Original had error that made it too thick causing stock bolt to be short.