This is new information for me too. I'd sure appreciate the part number. Since installing an AFX rotor in my 2188 my capacity limit in high yielding corn is now my clean grain elevator. As long as I kept the total flow to around 2400 bushel per hour I was ok. Granted that was as fast as the auger wagon and semitruck could keep up with anyway, but if there is a part that will increase capacity I'll sure give it a try. Thanks!