I'm not sure I'd like to have spacers....I'm not tall by any stretch of the imagination but I'd not like to sit any higher.
Incidentally Dave, have you compared windscreen heights between the Roadster and the 4/4? Looking around the showroom at BHM yesterday I started comparing screen heights.....well, beats counting louvres! Graham's 4/4 and a Plus8 had lower screens than a new Roadster and a Plus4 Supersport. My Roadster and my old broken screen off my 4/4 are the same height.