BMW Cooling System O-Ring Kit 5 Series E60 N52 523 525 528 530 Radiator Hose Set
BMW installed both the M54 and N52 in the e60 and e61 chassis. N52 Kits will also include the little green o-ring for the sensor in the lower radiator hose (1743299 ) and BMW Part # 11517514942. 5 Series e39, e60.