I've never paid attention to how auto wire harness would attach to a car body, but this would work. I don't know so much about the fence because it would require an insulator. This thing basically looks like the plastic equivalent used today.
The other piece was somehow used to maintain a perspective between to thin pieces. They were each fastened between the two sets of flat pieces and anchored with the center bolt. The pins on the sides were to keep them from rotating but beyond that I'm lost!