My pregen has standard 7/8" OD bars. Mirrors like that usually will clamp to the OD. The supplied adapter will go in the bar and provide a 7/8" OD surface for the clamp to go on if you can't put it directly on the bar OD. I always clamp them right to the bars without adapters, but I had to move the throttle in about 1/2 an inch, drilling a new locating hole for it in the bar. The clutch side was probably similar, but it's been a while.
Newgens may be the same. (?)
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