yeah I saw your pic of those BB. But these are the standard Triumph ones - well actually they aren't, cos I have had some taller ones made (£36). These close the gap between the top of the standard leg shields and the bottom of the standard Roadster screen. I did this because when I attached some bits of thread to various parts to see where the buffeting was coming from - that little gap was a major culprit.
But the taller bits of perpsex use the same fiddly clamps. I'm trying to get my conversion time from mean muscle bike to comfortable tourer down to less than an hour (that involves fitting the legshields, the screen inc fitting kit, the satnav, rear rack, seat with rider backrest, and standard softer triumph shocks for the sportier hagon Nitros)
Mike