Of all the components used in this assembly the Tube is the most expensive.
Some items from this specific schematic: Rotor-pump,in, Filter-oil, Gasket (nas), Bolt-flanged,6x12.
The most reasonably priced component used on the Kaf620-mbf Mule4010 2011 Usa / 4x4 Oil Pump/oil Filter is the Bolt-flanged,6x12.