The sixteen Tx500 1973 Usa Valve - Rocker Arm1 component parts are all listed in this schematic.
The component with the lowest price in the VALVE - ROCKER ARM1 schematic is the Bolt (371-12157-00).
With all the components that make up the TX500 1973 USA VALVE - ROCKER ARM1 assembly. The Lock, Valve Spring Retainer is the most frequently specified with sixteen applications.