HEL3505 / 3505 - Application Notes 73-90 CHEVROLET/GMC C30 TRUCK CHASSIS 2X (a, b) 59-93 DODGE 100, 200, 300 2X (b) 65-72 FORD 100, 250 2X (a, b) 67-86 FORD F250 4X (a, b) (a) DO NOT USE WITH FACTORY OVERLOAD CONTACT SPRINGS (b) MOUNTING KIT REQUIRED - 2.5" LEAFS #HEL25250 / 3" LEAFS #HEL25300