I had a great seat on my Jet Star 2. It did not have a wood base, but a completely zipped cover over a robust foam with a strap that buckled under the deat frame on the tractor. The seat back was also not a "wood stapled" type but had a plastic back and fit nicely. It even fit my bottom and back comfortably.
I went to replace it and the Speer Cushion Co. replacement was some material on a hunk of wood. It looked ok, but it was also flared out where your legs hang over the seat. It wasn't comfortable or correct looking.
Can anyone point me in the direction of the really nice ones?