NOTE: BMW recommends replacing these parts when rebuilding any "old" style K bike pump.Kit includes a water seal (11 41 1 741 870), oil seal ( 11 41 1 460 329), housing o-ring (11 11 1 460 392), drive gear o-ring (11 41 1 460 328) & impeller spacer bush (11 51 1 464 902).NOTE: The old style (cast) impeller will not work with this assembly. The kit contains detailed installation instructions!: