The fifteen Xt350h (20kw) 1987 59y Germany 2759y-332g1 Front Master Cylinder component parts are all listed in this schematic.
The Bolt (3w5) is the cheapest item from this partsfiche.
A sample from the products for the Front Master Cylinder include: Cap, Reservoir, Screw,flat Head, Bolt (341), Hose, Brake 1.