The Washer,6.5x20x1.6,bla is the lowest priced item on this Side Cover/chain Case (zx1000-b1) schematic.
Some items from this specific schematic: Bolt-flanged,6x14,bla, Collar,6.8x10x22, Case,side Cover, Cover-side,rh,ebony/s.
With six applications this Grommet is the most specified part.