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, Captive Transmission Disc & D4378779N (Flywheel Side PTO Disc)The D4386347RU 11-3/4" Dual Stage Clutch Unit - Reman fits equipment brands such as: DeutzThe D4386347RU is a substitute for the following discontinued products: D4341321R