Passenger Backrest for 1800N with Corbrin Beetle Bags

I have a '06 1800N that came with Corbin hard Beetle bags and a Mustang (brand) driver's seat, passenger seat and driver backrest. I don't want to scrap the entire seat and start over, but does anyone know of a decent looking rear seat and passenger backrest system, preferably quick-connect/disconnect that will work with the Corbin bags?

All suggestions welcome.