Continued:
This the back side of the tab.
The Toyota motor with its original drive arm that I modified to allow some adjustment. The original wiper system requires approximately 2 1/2" of strock to operate. The toyota motor was about 2 1/4" inch diameter in its rotation. I added a small piece into the arm to get the correct stroke.
The Toyota motor has a splined shaft where the arm attaches so the arm can be rotated to the correct position.