The tillers listed for CK20 had PTO ratings that were too high for the 15.5 and 16.5 HST and Manual models respectively. I contacted a Kioti representative regarding this and they have revised the incorrect specifications. The KT03-47, and KT03-55 may be used on either CK20. These seem to be nice tillers, with heavy 80# chain drive and slip clutch protection standard. Thanks, John