The Bilstein B8 8100 (DSA) reservoir shock absorber is an adjustable large bore 60mm (2.65″ OD) direct fit solution for lifted trucks and SUVs.Constructed from aerospace quality billet components, the large 60mm ID shock body offers a higher oil volume capacity to control heat while tackling rough road surfaces over long distances. Click adjuster knobs allow easy and precise Dual Speed Adjustment of both low and high speed compression to tailor your ride to any surface. Each B8 8100 (DSA) offers a unique remote or piggyback reservoir solution for an easy, hassle free installation.These shock absorbers feature a monotube design for consistent fade free performance and utilize velocity sensitive digressive valve settings which are tuned for each specific application. The large 60mm piston design offers more comfort and control in all driving conditions. The Bilstein B8 8100 (DSA) will allow you to tame the terrain in comfort.