M-spacer - As owners of Ducati 'square headlamp 600SS, 750SS and 900SS know too well, it is annoying to have the line of sight, of the road and traffic behind blocked by your arms. Bolt these specially manufactured black plastic blocks, onto the bottom of your stock mirrors and see more behind you. Each kit contains 2 blocks and 4 stainless steel screws - everything you need for your bike. These really do work.... and we highly recommend them.