The component with the lowest price in the VALVE schematic is the O-ring (328,329).
This schematic depicts all components used in the Xg250 2005 4d61 Sweden 1d4d6-300e1 Valve partslist.
Parts such as the Valve: Spring, Valve Inner, Arm, Valve Rocker, Seat, Valve Spring, Shaft, Rocker are included in the Xg250 2005 4d61 Sweden 1d4d6-300e1 Valve parts fiche.