The most reasonably priced component used on the Tzr125r 1992 4dl2 Italy 224dl-354e2 Seat is the Nut, Flange.
The Seat is made up of components including this Single Seat Assy which is the most expensive.
Some items from this specific schematic: Washer, Plate (4w3), Bolt, Special (361), Washer-plain, Nut, Flange.