Of all the components used in this assembly the Valve Assy,2nd Air Reed is the most expensive.
Parts such as the Second Air (e18, E39): Clip, Bracket Comp,second Air, Hose Set,2nd Air No.2, Hose(4.5x8.5x600) are included in the Rf900r 1998 (w) (e02 E04 E18 E22 E24 E25 E34 E39) / P37 Second Air (e18, E39) parts fiche.