Try Biker's Friend Saddle Bags, there are five sizes and they come with backrest pads and lumbar roll. Although I have not made the purchase (about to), it looks like a good solution to the issue. Type in Biker's Friend and you should get to the store.

 

yeah thats the kury rider backrest. i bought it and in my opinion it is fugly. i ended up modifying it to take a harley passenger backrest. as the stock one was not that big or comfy. does the job but but not that prety

 

Did you find a driver's backrest?
My wife's bike is the same as yours. A backrest would really help her on the long rides.

 

Nope have not found anything yet. Figured out a work around for long hauls when I have my luggage, not all that comfortable though.