Those are some times called "Rag Joints" and should be in line. You must have the ends to use on the engine and rear-end also. Basically they are a flex joint that allows some mis-alignment, from mounting or twisting of tractor when in use, and vibration dampners for engine and trans connections. PLUS, that is how you disconnect those things with-out a major movement of rear or engine to get it out. AND, can be a place to tear loose if something should lock up in rear or engine to keep damaging the rest of tractor drive. Lots of makers used them, can't be much diff between them wouldn't think. Cub dealers might still have or Agco from Massey models. Not sure what Deere had, might check.