Oil Pump Drive Chain Kit part number 11417605366.Compatible with models equipped with N20 or N26 engines, including 2.0L and 3.0L variants.Fits 228i, 320i, 328i, 428i, 528i, X1, X3, X4, X5, and Z4.Includes oil pump chain, crank gear, counter balance shaft sprocket, and tensioner guide rails.Designed for direct replacement of the oil pump drive assembly.