I'm currently planning a T56 Magnum XL swap for my '14. Lethal Performance has a kit, but they also outline everything you need....
Kit Includes:
Tremec Magnum XL Transmission
FMC-BR3Z-7A508-B Slave Cylinder for 11-14 GT -OR-
FMC-4R3Z-7A508-AA Slave Cylinder for 05-11 GT
DSS-FDSH9-A-MAG2...