On this parts fiche the Bolt, Hexagon Sock is the most specified component.
The Water Pump is made up of components including this Water Pump Assy which is the most expensive.
Parts such as the Water Pump: Cover, Housing, Gasket, Housing Cover 2 (nas), Washer, Plate, Water Pump Assy are included in the Vp300 2005 1s63 Switzerland 1d1s6-300s3 Water Pump parts fiche.