On this parts fiche the Bearing, Thrust is the most specified component.
The thirteen Tz250 1980 (a) Usa Rear Arm component parts are all listed in this schematic.
Parts such as the Rear Arm: Rear Arm Comp Silver, Washer,thrust (drive Shaft), Bushing, Rear Arm, Seal, Guard are included in the Tz250 1980 (a) Usa Rear Arm parts fiche.