Do these mount directly to the factory fog light locations?

Yes. These replace your existing fog lights at the factory mounting points — no drilling or bracket fabrication required. The switch ties into the OEM switch location on your dash.

Will I need to modify the wiring or use a relay harness?

The included harness is designed to work with your truck's factory electrical. No additional relay or amplifier module is needed — wire it directly to the harness and you're done.

What's the difference between these smoked lenses and clear LED fogs?

Smoked lenses reduce direct glare and scatter light more evenly across the road surface, which can help in heavy rain or snow. You get the same light output as clear lenses but with a subtler appearance and slightly softer spread pattern.