Upgrade your Upper Supercharger pulley on your 2003 Cobra, Harley Davidson Truck, or Lightning with our Interchangable Upper Pulley Kit. Our pullies are made from the highest quality billet aluminum and features a black Hard Coat Anodized for 100 percent wear resistance!! . Our kit includes: -2.8" Pulley (*7lbs extra boost) -3.0" Pulley (*4lbs more boost) -Mounting Hub -Easy Press On installation. -Allen Head Fastening Hardware