One of my bikes came with a small extension mounted under the left side (clutch lever) mirror. Best described as a small, chrome barrel, about 20 mm in diameter and 30 mm tall. One end has a stud that screws into the hole in the clutch lever perch. The top end is drilled and tapped to take the mirror stem. It is rubber filled, like an isolastic bushing (Dunlop called them “metalastic”). It doesn’t really take out or add vibration, but it DOES raise up the left mirror and make it more useful. It also makes it the same height as the RHS, raised up on the master cylinder. Makes a difference.
Anyone seen these for sale anywhere? I’d like a few more........