Hellwig EZ 990 Add A Leaf Stock Height Rear Helper Spring Kit Silver Powder Coat Ford Fullsize Truck 2004 08 DK18347311SFI Features:Standard height housings designed to AA0224BG2X580101 Features:Standard height housings designed to work with cast intake manifoldsCNC machined billet aluminum housing and Dupont Rynite basePolished steel shaft with a QPQ coating for friction reductionShaft is guided by a sealed ball bearingMust be used with an MSD Crank Trigger and MSD Ignition ControlSupplied with a large diameter HEI style distributor cap and rotorSupplied with bronze gear improved Thermal Conduction Technology (T C T) having attended the first ever SEMA show in Los Angeles in the basement of Dodger Stadium Helper Spring Kit