Some items from this specific schematic: Cylinder Comp., O-ring,11x2.5, Valve,oil Control, O Ring,61.8x2.0.
The O Ring,61.8x2.0 is the most widely applied product in the CB650 1981 (B) E-5 CYLINDER ( four times ).
The lowest price component in this E-5 Cylinder parts-list fiche is the Pin,knock 12x18.