A sample from the products for the Seat include: Seat Assy, Plate,seat Support Brkt, Cap,seat Lock, Cushion(11.5x22x20).
The most reasonably priced component used on the Tr50s 1999 (x) Seat is the Cushion(11.5x22x20).
nine components are listed in the schematic for this Tr50s 1999 (x) Seat .