Parts such as the Seat: Bolt-ws,6x16, Seat-assy,blue, Bolt-ws,6x35, Grip are included in the Jf650-b1 Jetski 1989 United Kingdom Fr Al / Ts Seat parts fiche.
With ten applications this Washer is the most specified part.
The five Jf650-b1 Jetski 1989 United Kingdom Fr Al / Ts Seat component parts are all listed in this schematic.