The most reasonably priced component used on the Gs500eu 1995 (s) Austria (e39) Front Master Cylinder is the Screw.
Some items from this specific schematic: Union, Cylinder Assy,fr Master, Hose,fr Brake,r, Cup Set,master Cylinder.
This FRONT MASTER CYLINDER assembly utilises four Washer(10x15x1.5)(s) - the highest specified component.