Dynamo Tail Light Adapter: Rack mount light to M5 rack boss mount

Mount up a Supernova or Schmidt or Busch and Muller two bolt rack mount light to a bike that lacketh a rear rack.  Mounts to the rack mount at the top of the frame's seat stay.  We reckon this is the best set up for folks without fenders, as it's not obscured by a saddle bag like the seatpost mounted lights are.  These aluminum brackets are lightweight and stiff.  They do NOT come with hardware.  You can put an M5 bolt right through, which the Schmidt lights come with, and back the bolt with an M5 nut.  Left side only, for riding on the right hand side of the road.