From what I have read they do not accept the ball and socket joint on my car. So, what type of retainer does it have and would GXP'* work on my car?
I am not real clear on what you are trying to accomplish as the headlights should be the same as yours according to your pictures.
But, on the GXP headlights there is a plastic piece at the bottom that slides into a slot as you slide the headlight back into place, there is also a "ball and socket" type connector on the side where it "pops" into place at the fender, and then there are 2 bolts that are used to tighten the headlight down once it is slid into place.
I believe that describes them pretty well and I hope it helps you out.