Parts such as the E-14 Rear Case: Oil-seal,15x25x7, Case,rr., Bolt,flange,6x22, Gasket,rear Case (mca) are included in the Gl1100 1982 (c) E-14 Rear Case parts fiche.
The Nut,hex 6mm is the cheapest item from this partsfiche.
This schematic depicts all components used in the Gl1100 1982 (c) E-14 Rear Case partslist.