look for barend mirrors that plug into the end of the bar rather than clamp around it.
makes for a better connection, less vibration, clearer view.
leaves bar less cluttered.

measure the inside of the bars...........you may find motorcycle barends fit your fatter bars better.
if the plugs are too thin, just add shims.

something like this on ebay
https://www.ebay.com/itm/293576916237
https://www.ebay.com/itm/286443332639
https://www.ebay.com/itm/173902756265

i've used this mirror for years.
solid connection, no joints, no flex, no vibration, wide view.