The twenty-three G3tr Bushmaster 1969 Usa Canada Seat/chain Cover/chain ('74-'75) component parts are all listed in this schematic.
In this schematic the "Washer-spring,6mm" is used most often.
A sample from the products for the Seat/chain Cover/chain ('74-'75) include: Hinge,rear, Hinge,front, Damper Rubb-dual Seat, Seat Hook.