DTA 70007 Full Set 4 Complete Strut Assemblies With Springs and Mounts Ready to Install OE Replacement 4-pc Set Fits 2007-2013 Ford Expedition 2007-2013 Lincoln Navigator Without Air Suspension 2007-2013 Ford Expedition,Lincoln Navigator Without Air Suspension. NOT For 2014 Models The strut is nitrogen gas charged with 4 Lip Teflon banded Piston Seal, micro polished chrome plated piston rod and all weather SV3 fluid. Coil Spring is heated treated & powder coated to ensure longevity and protection from Corrosion. Spring seats insulated to springs to ensure quiet and comfortable ride quality. Neoprene boots and bump stops when applicable. Limited Lifetime Warranty