Parts such as the Frame: Bolt (656), Steering Lock Assy (371,447), Frame Comp Yamaha Black, Nut, Flange(38w) are included in the Rd350 1973 Usa Frame parts fiche.
In this schematic the "Ybs67-8 Washer, Spring" is used most often.
The component with the lowest price in the FRAME schematic is the Ybs67-8 Washer, Spring.