The component with the lowest price in the TRANSMISSION schematic is the Circlip, 25m/m.
Parts such as the Transmission: Circlip, 25m/m, Pin, Shift Fork, Washer, 17x32, Cir-clip,22mm are included in the Tl250 Trials 1975 K0 Usa Transmission parts fiche.
In this schematic the "Pin, Shift Fork" is used most often.