HEL2527 / 2527 - Application Notes 2002-2006 CHEVROLET/GMC 1500 HD (b, c) 2002-2006 CHEVROLET/GMC 2500, 3500 HD 2X, 4X (b, c) 2007 CHEVROLET/GMC 2500, 3500 HD CLASSIC 2X, 4X (b, c) 2003-2007 DODGE 1500, 2500, 3500 2X, 4X (a, c) 2008 FORD F-250 / F-350 SUPER DUTY 2X, 4X (a, c) (a) DO NOT USE WITH FACTORY OVERLOAD CONTACT SPRINGS (b) WITH 43" OR LONGER BASE LEAF (c) REQUIRES LEAF MOUNTING KIT - VEHICLES W/ 2.5" LEAFS #HEL25250 / 3" LEAFS #HEL25300