The most reasonably priced component used on the Xt225 Xt225c 1997 (v) Usa California Seat is the Bolt, Flange(8ab).
Some items from this specific schematic: Bracket, Seat, Seal, Bracket, Seat, Bolt, With Washer (3ls2).
On this parts fiche the Bolt, Flange(8ab) is the most specified component.