On this parts fiche the Stud,10x27 is the most specified component.
A sample from the products for the Rear Hub include: Bearing-ball,#6205c3, Shoe-brake (mca), Spring-brak Shoe, Belt,drive,128t.
This schematic depicts all components used in the En400a2 Vulcan 1986 Canada / Liquid Cooled Rear Hub partslist.