1-1/2" and 1-5/8" kits include front pulley, belt, clutch hub, clutch basket and aramid clutch set (consists of two half plates, four full plates and five steel drive plates). Direct bolt-in applications. 3" electric start kit includes front pulley, belt, clutch hub and clutch basket and aramid clutch set (consists of two half plates, four full plates and five steel drive plates), 6061 T-6 billet motor plate, outside guard and polished pulley cover. All systems come with the Quiet Clutch system. Precision-machined, polished aluminum pressure plate uses nine springs and shoulder bolts to ensure even spring pressure (included in kit). Rear pulley has a 40mm, double-row bearing with an inner stress-proof steel clutch hub to support the clutch. Made in the U.S.A.. 3" system is not designed for use with floorboards.. Not for use with offset primaries..