The Nut is the lowest priced item on this Rear Cushion Lever (gsx-r1000 L2 E03) schematic.
Some items from this specific schematic: Bearing(17x24x32), Lever,rr Cushion, Bearing(20x27x32), Bracket,rr Shock Absorber Upr.
With three applications this Washer(12x34x1) is the most specified part.