Check out any of the twenty-four Rear Swinging Arm (model K3~f.no.32113657) components enlisted.
In this schematic the "Seal,oil(22x29x4)" is used most often.
Some items from this specific schematic: Shaft,rr Swgar, Swingingarm Set,rr, Bearing(22x29x30), Bush,rr Swingingarm Pivot.