get a sports ventura rack bolts underneath not pretty but gives
pillion something to hold other than you or get a hot chic that you really want to have all over you works for me
dont know if you have looked but this is my pillion seat, keeps pillion where they should be! http://www.rsvzone.com/forums/showthread.php?t=10121 it takes less than ten mins to put on for when its needed. its also really comfy so no compaints from the missus