The RH Cups are too wide of a spoke for me, plus no one I know of has Brocks, so why not get them
The only place I even know that sold them was Venon Motorsports in the UK. I tried with a few shops in the US and no one will get them in, not even the guys that do other importing.
As for the Quaiffe, I know I need it, if I am cruising conservatively and I hit it a little harder @ 3k rpm the tires break loose, almost like I would have dropped the clutch.