The most reasonably priced component used on the Gsf1200 1998 (w) (e02 E04 E18 E22 E25 E34) / P37 Front Master Cylinder (gsf1200t/v/w/x/st/sv/sw/sx) is the Screw.
Some items from this specific schematic: Holder, Protector, Piston & Cup Set, Bolt(6x38).
The Front Master Cylinder (gsf1200t/v/w/x/st/sv/sw/sx) assembly is constructed from several parts from which the Cylinder Assy,fr Master is the most expensive.