This schematic depicts all components used in the Jt1500-acf Jetski Stx-15f 2012 Usa Seat partslist.
On this parts fiche the Nut,8mm is the most specified component.
A sample from the products for the Seat include: Plate,front Seat Hook, Washer, Washer,8.5x25x1.5, Bracket,seat.