Moog ST8568 Strut and Coil Spring Assembly Problem Solver Triple Piston Seal offers dual protection to an enhanced main seal, resulting in longer life. Top plate tested to one million cycles under extreme load to ensure smooth operation and long life. The coil spring is engineered for long term, consistent performance. A premium coating is applied for optimal corrosion resistance. It is recommended to replace shock or strut in pairs (passenger and driver side at the same time) Fitment for st8568 is ford f150 4wd 2004 to 2012, ford f150 4wd 2004, ford f150 4wd 2005, ford f150 4wd 2006, ford f150 4wd 2007, ford f150 4wd 2008, ford f150 4wd 2009, ford f150 4wd 2010, ford f150 4wd 2011, ford f150 4wd 2012, lincoln mark lt 2006-2008, lincoln mark lt 2006, lincoln mark lt 2007 and lincoln mark lt 2008