Designed for the serious off-road adventure seeker, the all new BILSTEIN 6100 Series Kit is the ultimate suspension solution. The 6100 Series optimizes off-road and on-road capabilities with a 60mm digressive piston for increased damping control. This kit uses the OEM coil springs with an adjustable spring seat which allows for vehicle leveling, larger tires, and increased ground clearance. The kit comes with (2) 60mm shocks and (2) billet spring seats. The 6100 is a direct bolt on application for late model half-ton trucks and SUVs which utilize a factory coilover suspension. The 6100 kit is for front applications and reuses the OEM coil springs, top mount and spring isolators. To maximize performance, Bilstein recommends 5100 shocks for the rear.