This conversion system allows use of any standard 2.5- or 3-inch coilover shock available today. We opted for a pair of 2.5-inch Fox Racing Shox with remote reservoirs because we believe they are a superior design for this particular application. We like the Fox units because they are composed of high-quality internal parts such as solid 17-4 stainless steel shock shafts that measure a whopping 7/8 inch in diameter. Fox also leads the industry in terms of product confidence, as each and every shock the company sells is backed by a full one-year warranty against defects. It's also worth mentioning all the details about the warranty are published very clearly on Fox's Web site for would-be buyers. We also added a pair of Eibach (PN 183104) springs to provide the necessary spring rate for our V-10-equipped donor truck. Eibach springs are the gold standard of the coil-spring industry. We like that they come with a million-mile warranty, too.