The Water Pump (st1100n/p/r/an/ap/ar) assembly is constructed from several parts from which the Pump Comp,water is the most expensive.
In this schematic the "Bolt,flange,6x22" is used most often.
Of all the components that make up this Water Pump (st1100n/p/r/an/ap/ar) the Clip,tube,b12.5 has the lowest price.