Engine Parts Piston & Rings Set compatible with 4.4 L V8 Gas N63B44A engine.Fits X5 (E70), X6 (E71), 550i, 650i, 750i, and F07 models equipped with the 4.4L (4395cc) N63B44A engine.Part number: 11257649927. Also compatible with OE part numbers: 11257613626, 11257576475, 11257556955, 11257574822, 11257574823, 11257617547. Specifications: Compression height 32.1 mm, length 52.6 mm, pin/bolt length 60 mm, pin/bolt diameter Φ22 mm, cylinder bore diameter Φ89 mm.Designed for engines with compression ratio 11:1.Includes one complete piston and rings set as shown in product images.