Fenrir CNC on Amazon. They are a little more than the cheapest but, mine are 3.5 years old and survived 2 drops. I'm 6'1" and I can see better than with the OEM mirrors. DON'T buy any MVS brand they are made from Chinesium. FENRIR CNC https://www.amazon.com/dp/B07XT7RQDZ?ref=ppx_pop_mob_ap_share
From Amazon believe it or not Amazon Bar End Mirrors Had to make some slight modifications to them but for the price I can’t complain.
I have fenrirs on my monster too, I do like them quite a bit. They've raised their prices on Amazon a little as they've gained in popularity. Used to be $40, now they're $55-60. Quality is nice.