Some items from this specific schematic: Bolt,1, Cover,crankcase 2, Cover,1, Puller,chain 1.
The Dt50rsm 2004 2c31 Belgium 1c2c2-300e4 Rear Arm consists of twenty-five pieces with the Rr. Arm Comp. being the most expensive.
On this parts fiche the Washer is the most specified component.