09-14 F150 6 Inch Rear 2.5 Vs Pb Pair ICON Vehicle DynamicsICON Vehicle Specific (V. S.) 2. 5 Series shocks are designed and built to give your vehicle outstanding performance off road and a smooth ride on the street. These shocks are configured specifically for each application in both length and damping tune. Like all ICON'S Shock Absorbers, V. S. 2. 5 Series shocks are 100 Percent rebuildable and 100 Percent revalveable. For piggyback and specific remote reservoir applications, ICON'S unique use of a 6061