Brand New Zone Offroad FOX 2.0 Adventure Series Front Shock (Part #FOX98450613). Built specifically to compliment your lift kit, FOX's proven damping technology provides a comfortable on-road ride and predictable off-road handling in a variety of conditions. Their monotube design uses an internal floating piston (IFP) to separate the shock oil from the high-pressure, nitrogen-charged gas chamber, preventing oil aeration for fade-free performance in rough terrain. Fits: Chevrolet: 2011-2019 Silverado 2500 HD with 5" Lift 2011-2019 Silverado 3500 HD with 5" Lift GMC: 2011-2019 Sierra 2500 HD with 5" Lift 2011-2019 Sierra 3500 HD with 5" Lift Features: Thick silver powder coat. 2.0 Smooth bore and honed seamless alloy bodies. Quiet nitrile rubber allows for increased suspension articulation. Internal IFP mono-tube reservoir design separates shock oil from the high-pressure nitrogen. Direct replacement for stock and aftermarket lifts kits. JM92 Advanced Suspension Fluid for improved performance at variable temperatures. 5/8" hard chrome plated heat-treated alloy steel. Specs: Lower Mount Type: Clevis Upper Mount Type: Clevis Gas Charged: Yes Adjustable: No Compressed Length: 15.98 Inch Extended Length: 24.58 Inch Travel Length: 8.6 Inch Shaft Diameter: 5/8" You can view and download the assembly or instruction booklet here.