Afternoon matt, I used "Oberon performance" bar end mirrors on both my XBR caf racer and triumph speed triple. Brilliant products, very well made and no vibe issues, even on the speedy when I wasn't hanging around. If you know what I mean. Not the cheapest bar end mirror out there and quite a few copies nowadays too but I would defo recommend them and I'll most definitely be getting anther one for the street tracker when finished.
Cheers..Michael