The Water Pump is made up of components including this Pump Assy,water which is the most expensive.
On this parts fiche the Bolt,flange,nshf, is the most specified component.
Some items from this specific schematic: Bolt,flange,6x85, Bolt,flange,sh,6x25, Oil Seal,13x22x5, Gasket,slave Cyli (nas).