I'm using these cheap amazon ones, I didn't use the end caps they came with since the mirrors fit over the stock bar ends. They're pretty great considering the price and look great. Visibility is decent, though I have to readjust them more often than I'd like since they tend to shift a bit at high speeds. For that reason I'm considering spending more on some legit ones, but these are still good if you don't wanna shell out 100 bucks a mirror

I got these and they're working just fine: https://www.amazon.com/dp/B071S21FV8/

Was slightly tricky to install because of the plastic spacer thickness didn't make any sense, but figured it out ultimately.

I've bought a few off amazon now.

https://www.amazon.com/gp/product/B071S21FV8/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Those ones (there's more than a few identical ones) are all pretty decent build quality.

If you don't need the 12mm internal expanders (Aluminium bars do, due to the thicker walls), get the rubberized inserts. They help with vibration and seem less prone to moving around.

Here they are on my bike with drag bars: https://imgur.com/a/cSYT7Pq

And here they are on my renthal ultralows: https://imgur.com/a/Mr1OuPO

I'm not sure how I prefer them oriented tbh, but they fit both ways without much issue.

I've had these on mine for almost a year and love them https://www.amazon.com/dp/B071S21FV8/ref=cm_sw_r_cp_apa_fabc_6.V0Fb750ESK4?_encoding=UTF8&psc=1

I’ve always gotten some cheap ones on amazon that help up great over time. I just bought [these](Bar End Mirrors, KEMIMOTO Motorcycle 7/8” Handle Bar End Side Mirrors for Suzuki, Honda, Kawasaki, Scooters, Aprilia, Triumph Speed Triple Updated https://www.amazon.com/dp/B071S21FV8/ref=cm_sw_r_cp_api_C7qsBb1QN44NY for my speed triple I am picking up tomorrow.
I’ll get them Sunday and let you know how they are.