Parts such as the Oil Pump: O-ring (6g8), O-ring (6g8), Washer, Plain (646), Key, Woodruff (654) are included in the T9.9elrb/elhb/exhb 2003 Oil Pump parts fiche.
This schematic depicts all components used in the T9.9elrb/elhb/exhb 2003 Oil Pump partslist.
The most expensive part in this assembly is the Shaft, Cam.