The component with the lowest price in the SUB-TRANSMISSION schematic is the Ball,steel.,8.
On this parts fiche the Screw Cross 6x30 is the most specified component.
Parts such as the Sub-transmission: Shaft Shift Fork, Gear Sub Cont., Gasket,submission, O Ring 7.5x1.5 are included in the Atc90 K2 1974 Usa Sub-transmission parts fiche.