Very sorry guys I forgot to report back on the Rain Cover..

The Cover is from JP Cycles and is a one piece cover with a section that covers the backrest. If anyone forgot I have the Corbin Dual Tour with Drivers Backrest.

http://www.jpcycles.com/product/802-159

It ha s a tag inside "Made by Mustang". It will fit but I had to cut the elastic to do so. Also I can NOT sit on the seat while the cover is on, but that is OK for me. for $28 it does what I want..