I think we are Correct:
The Missing Terminals would be the Two for the Washer fluid Pump which is not included in this Service Part. The Housing gear box extension is Round, 1968/69 is Oval. Here is a previously sold (By Anthony) item here at Y.net same PN for Reference.
https://www.yenko.net/forum/showthre...hlight=4911476
Also see Heartbeat City NOS Part # NOS-0217 for compare
Sale Pending & I will reach out to potential buyer that they are comfortable with my ad title.