1-5/8" Belt Drive with Chain - 5-Speed 8mm Belt Drive with Quiet Clutch System 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.