The Cap-breather is the lowest priced item on this Front Brake schematic.
On this parts fiche the Bolt is the most specified component.
Parts such as the Front Brake: Breather-brake, Cap-breather, Packing (nas), Clip, Pad are included in the Zx1100e2 Gpz1100 1996 Europe Uk Fr Nl Ar Fg Gr Nr Sd Sp Front Brake parts fiche.