Note that these are slightly smaller than the stock lights. I believe this is a benefit due to the added airflow to the lower portion of the radiator and trans cooler.
A little dirty, but this is standing in front of the car, looking down at the back side of the passenger side light. You can see I just used sheetmetal screws to attach the Navigator bracket to the stock bracket. Only the stock reflectors and aiming assemblies were removed.
The stock brackets come out with 3 nuts (10mm). Very easy to remove and modify.