I have been thinking about what I could do to put a more comfortable seat on my trykes without spending much money. I know we have a huge thrift store here that always has old excercise bikes out in a fenced area where they keep junky stuff like outdoor toys and misc junk you can buy for next to nothing. Maybe 10 bucks for the excercise bike. What are your thoughts on doing that? Many of those seats are nice with backrests.
"BigJim' has an exercise bike seat, great padding and good for its very reclined position, not sure how good it would look on a narrower bike but should look fine on a trike!
Actual seats, as opposed to saddles, are really only well suited to recumbents. In fact, you'll notice that the seat you pictured is on a recumbent exercise bike. If you want that really full butt and back support, then you need to either have the cranks way out forward or have the seat so low that your knees are bent enough to clear the seat, (muscle fatigue).
I've thought for awhile now that there is a lot of room for overlap between choppers and recumbents and that combining the two might just result in a bike that was both attractive and practical.
That seat bottom pictured looks exactly like a tryke western saddle. There is a company called Derri Air that makes mounting hardware kits to adapt exer seats to bikes but they arent cheap.
Old school Schwinn Exerciser bike seat, vinyl and padding stripped off, add fake worn paint. Layers, white, red then black, then 4/0000 steel wooled.... comfy steel pan springer. Almost looks like old worn leather.