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
You would think that as many talented people here on the forum that someone would try to re-produce the heat stoves for these cars. I know I would be interested in a set for my SS