Bilstein B8 5100 Series shocks feature a monotube design for cooler, more efficient operation and longer life. They have the largest available piston diameter, providing superior handling and performance. The shock’s patented digressive valving instantly reacts to changing surface conditions for maximum comfort and control—on and off the road. These shocks also have split compression and rebound valving tuned for each specific application. Order the model designed for your year/make/model.