This Cylinder-assy-master, is the most expensive of the items that make up this Rear Master Cylinder assembly.
The most reasonably priced component used on the Kmx125-a4 1989 Europe Uk Gr Nr Sd St Rear Master Cylinder is the Pin-cotter,2.0x15.
Some items from this specific schematic: Piston-comp-brake, Pin-cotter,2.0x15, Reservoir, Diaphragm.