On second iteration, will post pics of mirrors mounted and link to mfg once its done.
7mm end is mirror attachment point, 8mm end is where a thru bolt goes thru the door hinge to bolt it on. 2 versions , one for using a nyloc nut with 8mm bolt, other to thread the bolt directly into part with the bollt creating its own threads on installation, acting similar to a nyloc type thread interference.
The anti rotation goes over hinge end and stops the assembly from rotation using the hinge body.
Its stronger if you print with the turn flat to bed horizontally, not needing supports either.