I noticed the passenger side corner light was loose, rattley.
So i popped the black plastic top piece (exposed when you open hood, above the light).
One large bolt holds the unit in place. I used a small ratchet to get it off (metric nut).
Turned out that someone had previously repaired the plastic light casing.
It has a plastic extruded bracket with a metal clip that the bolt screws into.
This piece had snapped off (perhaps when someone dinged it in a parkinglot).
SOmeone else had previously repaired it by hotglue-ing it back on, and then adding a small L-shaped sheetmetal strapping and pop-riveting that in place to help hold the broken piece back on.
The glue had torn away, and all that was preventing the light from sailing into a ditch on the highway was the small 3/8" x 1" strapping, (and one pop rivet).
But I liked the principle of the metal replacement.
So I stripped out the old hotglue, drilled out the poprivet, and removed the strapping.
The two pieces still fit together, (the piece that holds the metal retaining bolt clip, and the rest of the box).
I cut out a larger piece of sheetmetal, about 1.5" by 2" and bent it in an L shape, and drilled one large hole for the bolt to pass through.
The piece covers the bolt hole (and clip) then folds down the side of the lamp bracket (the light is all one piece).
I drilled 3 holes on the side ( 1/8" for 3 more popriviets), spaced out so that the plastic was not weakened too much.
Popriveted this plate in place. Now what happens is the metal clip is pressed against the metal plate, between the body and the lamp.
The metal clip holds the plate, and the plate is pop riveted on the side of the light. Its mechanically solid and a lot stronger than both the repair, and probably the original design.
I may make a plate for the other side, just to prevent a similar break there.