On this parts fiche the Washer,plain, 6mm is the most specified component.
Some items from this specific schematic: Nut, Flang, 10mm, Muffler Comp.exh., Packing,muffler, Washer Plain 6mm.
thirty-eight components are listed in the schematic for this Gl1200a Goldwing Aspencade 1987 (h) Usa California Muffler .