The mirrors show were originally mounted to a Yamaha Apex. I did not care at that time for the smaller windshield mounted Sidewinder mirrors and preferred to stay with the Apex model mirrors.
To make the Apex mirrors work, it required the lengthening of the square tubular mirror bracket mounts that attach the mirrors to the triangular mounts. (This was necessary because I believe the Apex handlebars were wider and the extension was needed to allow for the mirror to sit out a bit further to clear the vision past my shoulders when looking back through the mirror. Fortunately I knew of a professional welder that had the square tube and the ability to make the joints absolutely perfect. The welding is second to none on his work.