Don’t understand why a dealer would not have that part.  Might be a problem for some, but a good Toro dealer can use a little imagination to solve that problem.  Don’t know why they wouldn’t have it, but as I’ve said before, the boneyard is your friend.  I’ve got no problem using a used part, as I always inform the customer when doing so.   Just called the dealer I retired from and they have 4 in stock.