Precision engineered with G-Force technology for the ultimate in safety and performance, Working tube made of SteelPro™ alloy steel to provide superior strength, toughness and impact resistance while maintaining unmatched ductility, Surface-treated provides abrasive and contaminant protection while preventing rust, Piston rods made of S45C medium carbon steel for precision and wear resistance. Hard chrome plating process ensure extended durability of the rod, Reinforced piston provides optimal tube pressure control and resistance for increase ride quality, OE fluid contains special additives to perform among extreme temperatures and helps reduce oil breakdown, Professional grade fluid seal reduces excessive friction and increase longevity by preventing premature leaks, Nitrogen gas charge maintains road contact for enhanced ride and handling by reducing aeration and shock fade, Premium hardened mount following OE spec for easy installation. SAE-Grade bolt and nuts, Part Reference Numbers : DT551380 341967 69575 555601 33197 5993 3U2Z18124BG 3W1Z18124AA 3W1Z18125CA 3W3Z18124AA 3W3Z18125AA 3W7Z18124AA 3W7Z18124BA 3W7Z18124CA 3W7Z18124GA 3W7Z18125DA 3W7Z18125EA 3W7Z18125FA 3W7Z18125GA 4W1318080AB 4W1Z18124AA 4W1Z1