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, AK956052 HD6 (Captive Transmission Disc) & AK947089R (Flywheel Side PTO Disc)The AK954992RU 12" Dual Stage Clutch Unit - Reman fits equipment brands such as: David Brown, Leyland