Of all the components used in this assembly the Arm Set,swing is the most expensive.
With a quantity of four pieces, the Dust Seal,13x18x3 is the most used part in the SWINGARM/CHAIN CASE diagram.
Some items from this specific schematic: Dust Seal,28x37x4, Chain Set,drive, Bolt,flange 16x49, Washer,plain,16mm.