You have a nice-looking car. I have a 70 that is a very close match to yours. I'm looking for a 4 speed to park next to mine. Good luck with the sale and the remodeling project.
I thought the harness has a ground ring that goes between the wiper switch and the threaded metal nut that holds the switch to the dash bezel. That creates the ground for the wipers.
I have set of nos door edges guards that I may never put on but were an original option on my car. I would have to think hard about selling them. I found them on ebay