The lowest price component in this Seat/seat Cowl parts-list fiche is the Bolt-washer,6x12.
This SEAT/SEAT COWL assembly utilises four Cap,soc.bolt 8mm(s) - the highest specified component.
Some items from this specific schematic: Lock Assy,seat, Hook A,rope, Bolt-washer,6x12, Socket Bolt,8x32.