The Washer (14u) is the most widely applied product in the TDR250 1990 3CK2 EUROPE 203CK-300E1 REAR ARM ( three times ).
The component with the lowest price in the REAR ARM schematic is the Bolt(1wt).
Some items from this specific schematic: Nut, Self-locking(38v), Bolt, Flange(1kt), Holder, Brake Hose 1, Shaft, Pivot.