???? Fitment: Engine Balance Shaft Set compatible with Toyota Camry 2.4L 2007-2011, for Corolla 2.4L 2009-2013, for Matrix 2.4L 2009-2014, for RAV4 2.4L 2006-2009, for Solara 2.4L 2006-2008, for Scion tC 2.4L 2006-2010, for Scion xB 2.4L 2008-2015, for Lexus HS250h 2010-2012, for Toyota 2AZ-FE 2AZ-FXE 2.4L Engine. ? OE Part Number: 13601-28021, 13601-0H031, 13601-28020, 13601-0H030, 13601-0H020, 13602-28020, 13602-0H020, 13602-0H030. ??Function and Replacement: A properly functioning balance shaft not only reduces vibration, but also reduces engine support stress, improves oil pump efficiency, and helps stabilize oil pressure by minimizing oscillation. This indirectly ensures the health of the entire engine, making it run more smoothly and quietly, thereby improving the comfort of the driver and passengers; If your car shakes and roars more during acceleration, you need to check and replace this component. ?????Ideal Substitute: The balance shaft is made of high-quality materials that meet the original factory standards and undergo professional testing before leaving the factory to ensure the reliability, durability, and high performance of the engine balance shaft components. ???? Important Reminder: Please confirm whether the part model you need is correct before purchasing. We are committed to ensuring customer satisfaction. If you have any questions before or after purchasing, please contact us and we will reply within 24 hours. We have full confidence in our products and will never let you down. We wish you a pleasant shopping experience.