The most expensive part in this assembly is the Shaft,drive.
On this parts fiche the Washer,toothed,18.5x2 is the most specified component.
Parts such as the Transmission (ke100-a9/a10): Ball-steel,7/32, Ring-snap,16mm, Gear,output 2nd,30t, Washer,claw,8x22x1.2 are included in the Ke100-a10 Ke100 1981 Canada Transmission (ke100-a9/a10) parts fiche.