I've had the same interest in trying to adapt an rsv seat to my 06' rstd ever since my wife saw the difference. I even bought the Mustang seats hoping that would satisfy her, but no deal. I never could get anyone to satisfy me it would work. I did have the guys at the parts counter try and add up what I would be out to buy the seat and backrest to try, all they did was get wide eyes and whistle. My wife has some friends who ride touring scooters, she wanted to try one of them. Bingo! She bought an 06' Silver Wing and says she likes it so much she will probably never ride behind me again. So thats how I fixed the problem, and I still have my rstd!