I picked up a Corbin seat (with removable passenger back rest) for my 4th gen. It is used but in great shape, and was at about as much money as I was willing to spend for one. First Impression: (without riding the bike) The actual seat feels wider and more able to accomodate a larger rump. I'm a small fellah so I don't require that, but I hope it'll help on long trips. Second Impression: Man is this thing made well. Great looking and real solid. Third Impression: (related to 2nd impression above) MAN this thing is heavy! It weights quite a bit more then the OEM seat. Now the seat seams to latch in and fit quite well. But, the Corbin doesn't have the 2 "hooks" under the seat on either side. It just has the small loop on the rear that locks it in. Can anyone shed an light on this? I got pics if needed.