Parts such as the Taillight: Unit,tail Light, Lens Comp Tail Li, Light Assy.,licen, Buld,license are included in the Vt1100c Shadow 1100 1986 (g) Usa California Taillight parts fiche.
The Honda TAILLIGHT has thirty-four products enlisted in the schematic.
In this schematic the "Nut,flange,6mm" is used most often.