Originally Posted by desertdork

The GC2 uses an internal plastic plug in the end. Because of this, you can position the grip slightly inboard on the bar, thereby exposing a short section of bar for an external clamp. Or you can leave the plug off if the mirror uses an internal mount. The GC2 appears to be Ergon's only grip with this design. However, the bar end on this grip may be shorter than what you want.