On this parts fiche the Spring,brush is the most specified component.
A sample from the products for the Starting Motor include: Holder,brush, Nut, O Ring(d:3,id:24.5), Washer,lock.
The most reasonably priced component used on the Gv1200glf Madura 1985 (f) Usa (e03) Starting Motor is the O Ring(d:3,id:24.5).