I used Trico wiper rebuild kit from Mac's Model A parts . For KSB models .

Try Wiperman.com.  I think it's Frikin wipers.

Anyone know where I can source a wiper motor rebuild kit for a 31 PA?
This is a Trico motor like the ones used in the Ford Model A, kits for these are availability except the unit I have has two screws on the switch gear cover rather than the push and click cover. They look the same , but Apparently the rebuild kit for the model A will not work?

Dave