Thank you for the picture, pete. Your interior panel arrangement looks a bit different than mine. Interestingly, on your car the seat back panel touches the body shell except at the portion where the harness passes through. My car resembles the one in the linked picture from Ethel in post #4 above. My car has a longer gap that begins at the inner fender arch and extends upward. It's probably about 10 to 12 inches in length, but unfortunately a bit too narrow to accommodate 3 of the connectors.
When I bought the car, it came to me as a body shell and a bunch of boxes with various parts. It's a bit of a jigsaw puzzle. I think the body is from 1970 or thereabouts and I have no idea it it underwent any modifications during its lifetime. Perhaps this accounts for the variations in body panel arrangements.
Thank you for taking the time to post a picture of your car. Your help is much appreciated!!