A sample from the products for the Fr. Brake Master Cylinder include: Float,fr M/c, Plate,diaphragm, Bolt,oil,10x22, Cap,master Cylind.
In this schematic the "Washer,oil Bolt" is used most often.
The most reasonably priced component used on the Gl1500se Goldwing Special Edition 1992 (n) England / Mkh Fr. Brake Master Cylinder is the Screw Wash.,4x12.