On this parts fiche the Screw is the most specified component.
A sample from the products for the Front Master Cylinder (model K/l/m/n/p/r/s/t) include: Cap, Holder, Cylinder Assy,fr Master, Screw.
The most reasonably priced component used on the Gsx600fu2 1992 (n) Germany (e22) Front Master Cylinder (model K/l/m/n/p/r/s/t) is the Screw.