The KYB Coil Spring RX5558 is a new suspension spring designed to provide a comfortable and stable ride for your vehicle. Made with a coil spring design, this suspension spring comes with a bushing included for easy installation. The KYB brand is known for its high-quality automotive parts, and the RX5558 model is specifically designed for suspension purposes. With the manufacturer part number RX5558 and K-Flex extra description, this coil spring is a reliable choice for improving the performance of your vehicle.