This CAMSHAFT / VALVE assembly utilises four Cotter, Valve(s) - the highest specified component.
The most reasonably priced component used on the Atc90 K1 1972 1973 Usa Camshaft / Valve is the Seat, Vlv. Spring.
Some items from this specific schematic: Seal,valve,stem, Seat, Vlv. Spring, Cotter, Valve, Arm Rocker.