Fitment: for Ford F250 Super Duty 2005-2010 4x4 with In-Bed Hitch for Ford F350 Super Duty 2005-2010 4x4 with In-Bed Hitch Does not fit chassis models Fit Single/Dual Rear Wheel (SRW,DRW) models Fit all models without a fifth-wheel hitch Fit most side mount fifth wheel hitch Placement: Rear Feature: Up to 5,000 lbs capacity Fits 1/2-, 3/4-, and 1-ton pickups and vans with leaf springs Keep proper ride height Replace your factory jounce bumper Reduce bouncing at the rear of vehicle when towing Stop vehicle’s main springs from sagging (due to constant load compression) When towing / hauling heavy loads,air springs raise safety /comfort working with your suspension Two adjustable secondary air helper springs can add up to 5,000 pounds of leveling capacity per axle for vehicles with leaf springs Package Includes: 2x Air springs Air lines Schrader valve Mounting Bracket Hardware1.Notice：California Prop 65 Warning 2.Code: MXR02FXSY 3.Authority ID：MXR02FXSY