is a shot of the stock 'hangers' that the taillight frames mount to (with new hardware). It's really just a Z shaped piece of metal with 2 holes on it on each side.
Here's one from a passenger side removed from the truck
It has a hanger on the left side, and shows 2 bolts off for the right side
Here is what they look like deconstructed (from when I was repairing this lense):
You can see the tail light frame has a bunch of built in bolts that go through the rear housing and sandwich the clear and red pieces against the frame.
picture of one removed and you can see the screws though the back before it gets all busted up when you try to take them apart lol (and you can see the right side mount point on the truck in the top of the photo: