I have those exact mirrors fitted to my Z900. I am quite pleased with them, they fit well, feel sturdy, and allow a bit more flexibility with regard to adjustments than the stock mirrors. I contrary to what others write above, I experience no problems with regard to optics, at least not compared to the stock mirrors. I did experience three issues: 1) it's important to tighten the screws very
well, otherwise the mirrors could flap back at higher speeds; 2) I needed to buy extra spacers to fit the mirrors a bit wider, since my elbows were blocking half of my view before; 3) the screws in the kit are not stainless steel, they developed a bit of rust staining after a while, so I painted them black.