FOX 883-26-011 Fits Ford F-550 Super Duty 2005-2016 Front Lift 2-3.5" Series 2.5 Res. Shock (Pair)-Adj. FOX 883-26-011 Fits Ford F-550 Super Duty 2005-2016 Front Lift 2-3.5" Series 2.5 Res. Shock (Pair)-Adj. 2.5 Factory Series Reservoir smooth body shocks give you enhanced ride quality and the control you need when heading off the pavement. They take their design from Fox's off-road race shocks, so they've been thoroughly perfected in brutal conditions that you will probably never see. Our athletes push the boundaries in competition to develop race-proven performance you can bolt onto your Truck or SUV. Anodized aluminum external reservoirs allows for increase oil and nitrogen capacity while delivering striking race look. Dual Speed Compression (DSC) adjuster gives remarkable versatility and precise tuning. A simple twist of either two adjuster knobs allows twelve separate low-speed and ten high-speed compression levels. Our complete line of bolt-on, Factory Series shocks provide improved damping in any terrain. Experience for yourself the incredible performance and precise control that 2.5 Factory Series Reservoir shocks deliver.