Just picked up this super low mileage (3412 miles) 03 650. My last 05 had a rear passenger backrest, this one does not. I want to get a box for the back but I need a rack to mount it to. I can find OEM ones on EBay but they all say 05-11. Is there something different from the 03 & 04’s vs the newer ones as RO why it wouldn’t work on mine? Hoping someone can provide a link of exactly what I need to mount a box on. Thanks so much!!