This 4-cylinder piston ring set is designed for 2.0L N47 diesel engines.It matches OEM part number 11257812636 and requires no cylinder bore expansion.Cylinder bore diameter is 84.00 mm.Ring thicknesses are 1.75 mm, 1.75 mm, and 2.0 mm.The set includes piston rings for all four cylinders.Compatible with N47 2.0L diesel engines, including variants N47 D20 A, N47 D20 B, N47 D20 C, N47 D20 D, M57 D30, and N57 D30 A.