there more of a MX thing, their ok for guarding againg roost and brushes but wont help in a get off. MX'ers like em cause if they get in a mess its very hard to get your hands caught. nearly all brands do them, acerbis do a few, cycra, barkbusters. if you head to your local bike shop and ask about MX hand guards they should be able to show you 20 different model. if they cant, move to australia and come see me :) you know you want to... Oprah loved it :p
and its true most yamahas use l/h thread on one mirror