Case Colt Ingersoll Tractors
So I am also having trouble getting my sleeve hitch from a 1981 446 (serial number 14010996) to connect to my 1990 4020.
I've read this thread: http://casecoltingersoll.com/showthread.php/42178-Sleeve-Hitch-Dilemma
and it appears that the K24 should fit my 4020 since it is serial number...