Moog ST8571 Strut and Coil Spring Assembly Problem Solver lower mounting hardware included for ease of installation and a thorough repair. 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.