The Curt website now shows 2 different harnesses, 1 for LED equipped Broncos and 1 for Non-LED Broncos. You have to scroll down quite a bit to get to where it indicates which one you are looking at. The Non LED is the more expensive of the two.
The two metal bars surrounded by plastic on the back of the rear seats for car seat straps to anchor to. I believe the latch rotates in underneath it putting tension on the panel and holding it firmly in place.