Nick,
Thanks for posting the photos. Your first picture ( photo #3 ) was of particular interest, since I've been working on some brackets to keep the headlight rims from falling off.
I made two fairly "conventional" titanium brackets which I was going to mount this coming holiday weekend. ( as shown in photos #1 & #2, not mounted yet, just a mock-up )
To have a choice, and since this is all just a hobby, fun & a game, I had also obtained a pair of stainless steel accessory latches from Holden some time ago, polished them and thought about maybe using them instead ( photos #4 & #5, also mocked up with double-sided tape ). I bought them, convinced that using them as headlight rim retaining latches was actually my original idea.........wrong as usual.
Now that you've shown that the factory actually used virtually identical latches, which I had never seen used in that application before, ..........I'm really undecided.
(all the drilled holes are my doing, to match the damned doorhandles )