Grant Tuff Wheel

I drilled and tapped my 860 to use the factory adapter and horn button like it shows in the link abodyjoe posted above. Luckily I had an adapter, horn switch and horn button. Bought the wheel through Summit for like $38 and spent more time marking the holes and rechecking them than it took to drill and tap them.

Although the look isn't close to a real or repro Tuff Wheel, it does resemble it and I like the smaller diameter better.