I have that backrest from Fast Eddy and I think it is brilliant. Good support and very comfy. Easy to fit. Stacka also has one and he suffers from a bad back and he swears by it. Do a search for backrest with his name to get his review.

Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge