CRG Hindsight Bar End Mirrors will clamp directly onto most 7/8” or 22mm handlebars, but most prefer to use them with thees CRG Bar End Mirror adapters, which add about a half-inch to your overall bar width, but doesn’t require you repositioning your grips and controls. These bar end adapters come in 7/8” (~22mm) and 1” variations.
*Triumph owners – if your stock handlebars have a threaded boss welded into the end, you can still use these. You’ll need 1) a hack saw and 2) a little elbow grease. Lop off the post leaving about 2mm of shoulder of the CRG Bar End Adapter, ditch all the expanding wedge pieces, and it’ll bolt right on.