This core is extremely rare and your core is required to fulfill this order. Contact us for instructions on sending your core in for Rebuild & Return.Includes: PPA, D2214641 (Captive Transmission Disc) & D2214639 (Flywheel Side PTO Disc)The D2214640U 11" Dual Stage Clutch Unit - Reman fits equipment brands such as: Allis Chalmers