The most reasonably priced component used on the Cbr600f Hurricane 1990 (l) Italy / Kph Rear Cushion (2) is the Joint,pipe.
A sample from the products for the Rear Cushion (2) include: Damper Comp.,rear, Seal,dust (showa), Collar,cushion Ro, Bolt,flange,10x11.
In this schematic the "Oil Seal 17x27x5" is used most often.