I previously sent a review saying the mirror extension bolts didn't fit my Honda Hornet SP. This was down to me I'm afraid. Both mirrors are left hand threads and go into a second bush. To fit the mirror, tightening nut and bush need to be removed, considered as part of the mirror for attaching to the extensions. The extensions fit great and look fantastic and most importantly allow me to see around my wide shoulders. Can't recommend Evotech enough, quality and service.