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.Installed w/ a hanger. Positively identify length of backplate spacer before ordering.Includes: 1/2" Backplate SpacersThe 306271215 11" Single Stage Pressure Plate, w/ 1/2" Spacers - Reman fits equipment brands such as: International