The component with the lowest price in the REAR SUSPENSION schematic is the Nut. Self-locking.
Parts such as the Rear Suspension: Nut. Self-locking, Shock Absorber Assy, Rear, Bolt, Washer Based are included in the Yzf-r1 2000 5jj7 Germany 105jj-332g2 Rear Suspension parts fiche.