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 : 342558 81929 G63722 61616 565021 KG54324 344403 32306 37135 4886533AB 4886533AC 4886533AE 4886533AF 4886533AG 4886533AI 4897567AA 5015547AA 5114318AA 5114318AB 5174153AA 52060450AA 52087835 52087835AB 52088651 52088651AD 5208