Ok so may have answered part of my own question here for #3. I think the taped connectors I have in my hand in the photo are in fact these:
Which I believe are both the license plate bracket wires which connector into the metal connection rods at the bottom of the OEM tail license plate bulb assembly here:
So if all of my suspicions are correct the last two things I need to know, which I'm having trouble finding is which wire is positive and negative (on the rear harness (black or yellow) I'm assuming black is negative but I'd love if anyone else has a more concrete answer. And last thing is does any one know if the wire connector type that I would need to purchase to fit in those slots in the first image above?
Thanks again for any and all answers.