Bilstein 5100 Series 02-09 Chevrolet Trailblazer Front 46mm Monotube Shock Absorber (Height Adj)Bilstein B8 5100 (Ride Height Adjustable) shock absorbers are designed for trucks and SUVs with a front OE coilover style suspension. Multiple snap ring grooves in the body allow for different spring seat positions, providing 0 2. 75 inches of front lift with OE springs (depending on application). The monotube shock absorbers feature a 46mm digressive piston a with self adjusting deflective disc valve setting. Bilstein B8 5100 (Ride Height Adjustable)