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.12" Dual Stage Clutch Unit - RemanIncludes: PPA, Captive Transmission Disc & AK952378N (Flywheel Side PTO Disc)The AK202825RU 12" Dual Stage Clutch Unit, w/ Woven Disc- Reman fits equipment brands such as: David BrownThe AK202825RU is a substitute for the following discontinued products: AK202826