The Nut,flange,6mm is the lowest priced item on this Shift Drum/shift Fork schematic.
Parts such as the Shift Drum/shift Fork: Arm Comp,shift Dr, Spindle Comp,shif, Spg,shift Return, Fork Fr,gear Shif are included in the Gl1500 Goldwing 1990 (l) Germany Shift Drum/shift Fork parts fiche.
On this parts fiche the Roller,4x14.8 is the most specified component.