Tinbarn utube videos suggest that wiper motor has enough torque for a direct drive setup, but his Flintstone mounting system had gear reduction. PM25mv crank shaft (5/8") sticks out quite far, so your gear setup is space saving in the lateral dimension, in that the crank shaft and motor shaft overlap each other.
The ebay listing had a photo showing the EY part number as 641 2881 00 .
I've not been able to source a supplier of this gear as of yet, and wonder if anyone else reading this thread has suggestion for finding this part? You might also be interested in replacement parts if you strip a gear in the future by hitting the top detent, or crashing down into the table? ( S___ happens ?)