I bought a riders backrest from NZ early this year and to save p[ostage just had him send the backrest as I had seats here already. I think he has since resold it, but I can send you my dual headlight dual seat to suit now that I have the custom bracket for my Roadster and can use my riders backrest on my Rocket III Touring dual seat as well, $350 posted to NZ from Oz should cover it if you want my Dual Headlight Rocket III dual seat for your backrest.
For dual headlight models only... (the Touring was just an accessory name before the later RIII Touring model was released.
CLASSIC TOURING SEAT - DUAL A9708164
For use with Adjustable Rider Backrest A9708160
Shown with ADJUSTABLE RIDER BACKREST A9708160
For single headlight Rocket III Touring
LONGHAUL TOURING SEAT - DUAL A9700209
Shown with ADJUSTABLE RIDER BACKREST - LONGHAUL A9708158
BUCKET SOLO SEAT A9708162
Shown with ADJUSTABLE RIDER BACKREST - LONGHAUL A9708158
COMFORT PILLION SEAT A9708163