On this parts fiche the Plug,pin is the most specified component.
Parts such as the Front Brake Caliper: Seal Set,piston, Piston, Cap,bleeder, Shim are included in the Gl1500a Goldwing Aspencade 1993 (p) Usa California Front Brake Caliper parts fiche.
The Pin,bolt is the lowest priced item on this Front Brake Caliper schematic.