Brand New Zone Offroad FOX 2.0 Adventure Series Rear Shock (Part #FOX98450765). 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: Ford: 2011-2016 F-250 Super Duty 4WD with 6" Lift 2011-2016 F-350 Super Duty 4WD with 6" 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: Eyelet Upper Mount Type: Eyelet Gas Charged: Yes Adjustable: No Compressed Length: 22.26 Inch Extended Length: 35.85 Inch Travel Length: 13.59 Inch Shaft Diameter: 5/8" You can view and download the assembly/instruction booklet here.