The Bilstein B6 Performance Series shock absorber is a high-pressure gas pressure monotube upgrade designed for drivers who want improved handling and stability without sacrificing ride comfort. Optimized for use with original factory springs, this shock providing better fade resistance and consistent performance. Part Number 24-024464 features a 36mm monotube design for rapid heat dissipation and superior control. Sold as a single unit (1pc). Installation of this shock absorber on the rear axle of Jaguar XJ models typically requires 4 units per vehicle.