Parts such as the Rear Brake Master Cylinder: Joint A,m/c Pipe, Clamp,master Cyli, Brkt,fr,brake Hos, Plate,sw are included in the Gl1500a Goldwing Aspencade 1991 (m) Norway Belgium / Kph Rear Brake Master Cylinder parts fiche.
On this parts fiche the Washer,oil Bolt is the most specified component.
The most reasonably priced component used on the Gl1500a Goldwing Aspencade 1991 (m) Norway Belgium / Kph Rear Brake Master Cylinder is the Screw-washer 4x14.