Hotchkis Sport Suspension 1815R Rear Suspension Package in Red for 1999-2004 Mustangs. Made from quality TIG welded .120 in. wall steel tubing with billet CNC machined spring perch fitted with fluted polyurethane bushings. Our upper and lower trailing arms work together to positively locate and control the rear axle. Launches are quicker smoother and more consistent by eliminating wheel hop. Cornering and overall stability are dramatically improved through increased roll stiffness and sway bar effectiveness. The fabricated trailing arms are constructed from high quality TIG welded .120 in. wall steel tubing. They feature our exclusive billet CNC machined spring perch and are fitted with special fluted polyurethane bushings. Grade 8 Hardware is included with this suspension packages.