Do these mount at the factory fog light openings?

Yes. These bolt directly into the OEM fog light locations on Super Duty models — no drilling, no brackets, no modification to the bumper or trim.

Will I need new wiring or a harness adapter?

If your truck originally came with fog lights, the wiring is already in place — these are plug-and-play. If your model didn't come with fogs, you'll need to source a harness separately.

Are bulbs included with these lights?

Assembly pair is included — verify bulb type and condition before install, and replace as needed to match your desired output.