With a quantity of four pieces, the Bolt, Flange(6u1) is the most used part in the SEAT diagram.
Some items from this specific schematic: Seat, Battery, Grommet (462), Cushion, Single Seat Assy.
The most reasonably priced component used on the Tz125 1997 4jt4 France 274jt-100e1b Seat is the Bolt, Flange(6u1).