1、OE Number: The referencing OE number of this cylinder piston gasket head top end kit are 4J2 11111 00 00, 4J2 11311 00 00, 4J2 11311 01 00. 2、Fitment: The cylinder piston gasket head top end kit is a replacement for PW50 1981‑2022, for QT50 1979‑1987, please check the model before ordering. 3、High Durability: Made of strong materials, high strength, not easy to deform, long service life, strong impact resistance, reduce engine vibration, more stable and stable driving. 4、High Performance: The cylinder can also work reliably under harsh conditions, simple operation, convenient control, effectively improve engine displacement and performance! 5、Ideal Replacement: Direct replacement installation, meets or exceeds OEM standards for the replacement of old and damaged one on original vehicles.