The light housing is made of metal and there is a mounting hex nut supplied.
The light looks like it's weatherproofed, but time will tell.
The only hiccup is that the opening in the trim plate for the wiper shaft
is large and requires a large washer in the rear, and needs to be carefully
positioned to hide part of the hole on the right and left. I had to drill out a large 3/8 washer to 13/32" which required a drill press. For a better job I'd add another washer the thickness of the trim plate with some flats on it to center in the in the elongated hole. I used a lot of Harbor Freight's 2-part epoxy to keep it in place and tightened with a 15MM flare wrench.

The lights are so bright that a single LED on each side might work fine.
That would take a big load (18Amps) off the alternator and maybe result in a small
performance improvement especially in around town gas mileage where the car
is running at low RPMs and not developing full horsepower. The shifting through the gears might be slowed up as well with the constant added drag on the engine.

It would be interesting to do gas mileage tests , with and without headlights.
and see if the alternator drag alters the MPG.