The component with the lowest price in the SEAT schematic is the Washer(6.5x20x1.6).
Parts such as the Seat: Screw(6x20), Lock Set,seat, Washer(6.5x20x1.6), Bracket,seat Support are included in the Gsxr600 2012 (l2) Usa (e03) Seat parts fiche.
With four applications this Cushion is the most specified part.