The Washer is the most widely applied product in the JR50 1978 (C) USA (E03) REAR SWINGING ARM ( four times ).
A sample from the products for the Rear Swinging Arm include: Nut, Shaft,rr Swingingarm Pivot, Swing Arm Assembly,rear, Case,chain.
The most reasonably priced component used on the Jr50 1978 (c) Usa (e03) Rear Swinging Arm is the Bolt.