Parts such as the Rear Cushion Lever: Nut 12mm, Nut, Bracket,rr Shock Absorber Up, Absorber Assembly,rear Shock are included in the Gsxr600 1997 (v) (e02 E04 E18 E22 E24 E25 E34 E39) Rear Cushion Lever parts fiche.
In this schematic the "Bearing(17x24x20)" is used most often.
The lowest price component in this Rear Cushion Lever parts-list fiche is the Washer.