This clutch is similar to the  58SI  SensiFlex® shaft input tension control clutch.  It has been modified to include a pilot mounted coupling hub which mates with a spider coupling (a.k.a.  jaw coupling).  This clutch is drop-in ready to simplify installation.spider-coupling illustration

Would a custom design make your assembly process easier?  Mach III supplies custom adapters and couplings for many catalog models.