Any suggestions for aftermarket seats that are good for taller riders? I'm 6-foot-3, and I find that my legs and arms most comfortable when I push myself back so that my butt is an inch or inch-and-a-half past the back of the seat. Trouble is, then I'm sitting on the crack between the seat and the pillion seat, and that gets old. I've searched for threads that address this question; if they're there, I can't find 'em. I'd welcome advice from the oh-so-wise ones here.

'08 America, AI removed, National Cycle windscreen, bags, tach, dresser bars