Schmidt Handlebar Headlight Mount 719-110

Schmidt makes this attractive and rugged handlebar mount for oversized handlebars. It's available in polished aluminum as shown here, or in black anodized aluminum. The band is stainless steel (not pictured). You can use it on standard bars if you like; anything from 22.0-31.8mm. You just need to shorten the stainless steel band.

Very good mounting instructions are included with the mount.