I hope the following can help fellow riders of Rocker C bikes who want to retain their solo seat look, rear guard/wheel rocker action while wanting some lower back support for those long hauls.
I spent months trying to find a supplier who makes back rests for Rocker C's with no luck. I gave up and decided to modify one designed for another model of HD. I was lucky enough to find a Mustang brand back rest on this site which was surplus to Zyban's requirements. All I did was drill the mounting plate supplied and my fold out pillion seat base plate. It is a close fit but the test ride found the back rest in the right spot for me. Remove two 6mm SS bolts and it is original again.
By sheer arse it also locks in (anti-theft) the chrome solo luggage rack (pictured) and still allows the seat to be lifted for access to the battery etc.
Looks great