the Kuryakyn floorboards (4357) using the Kuryakyn splined adaptors (8813) they're a few posts in here. Just search keyword floorboards. I cannot paste a link on mobile now. Don't use what manufacturer says on their website for the spline adapter. Read the posts easy as pie.

I run darkside on my 2liter Vulcan. 30-40,000 miles on a hundred dollar tire. Work way better than you would think. I used to roadrace and thought I would try it, then be able to tell every one it is crazy unsafe... but 15 years later, two Vulcans, 140,000 miles, drag strip, tours to Alaska...