The component with the lowest price in the SHIFTER schematic is the Ybs67-5 Washer, Spring.
Parts such as the Shifter: Spring Torsion 132181240000, Cover, Change Pedal, Stopper Lever Assy, Clamp 164825940000 are included in the Yg5t Trailmaster 80 1968 Usa Shifter parts fiche.
With four applications this Pin,dowel (620) is the most specified part.