I just found and put a seat from a much newer model on my 1989 VT1100. It fit really well, the 2-up seat was a touch longer, so I had to ream the mounting hole a little to get it to go onto the bolt that sticks up out of the fender, but eventually I got it locked down.
I got all three pieces of the seat for $150 in perfect condition. I think the seat was off either a 96 or a 2006. I don't remember. PO switched to a Maverick single seat and just wanted the old on out of his garage.