My lights, mounted in the step bumper, are just bolted throught with two screws with nuts up in behind the bumber. I just replaced one of mine a couple of weeks back because the socket was rusted out and no longer worked.
The part was cheap and the swap was quick. Just splice the wire (unless it has a compatible plug) and screw the new housing in place. I used stainless steel fasteners to make future removal simpler - works slick.
BTW my lenses are clear (but they are not original equipment).
That's my experience.
