Some items from this specific schematic: Spacer,rr Swgarm Pivot Ctr, Bolt(8x38), Pin 20x20, Spacer,rr Swgarm Pivot Berring.
Of all the components that make up this Rear Swinging Arm the Pin 20x20 has the lowest price.
In this schematic the "Bearing(25x33x30)" is used most often.