4pcs 21mm 06D107066L 06D107066K 06D107066S 06D107066R Engine Pistons Rings Set For R S3 TTS 2.0 CDL This engine piston and ring set is designed for use with specific vehicle models equipped with 2.0 CDL engines.Constructed from grade 21mm 4032 steel, the components are engineered to provide enhanced compression and improved durability, contributing to better engine performance and extended service life.The set includes four pistons and corresponding rings, suitable for a complete engine rebuild. The design focuses on precise fitment and effective sealing within the cylinder bore, supporting engine under demanding conditions.Each piston is compatible with a 21mm wrist pin diameter, proper assembly and function in designated applications.This piston set supports both repair and performance upgrade needs for engines requiring this specification. Compatibility Advisory: This product is not affiliated with the manufacturer.Brand mentions are for fitment reference only.