Do I need to run new wiring, or does this use existing harnesses?

This assembly includes a wiring harness. Run it through the engine bay and into the cabin where the switch mounts on the dashboard. If your vehicle previously had fog lights, you can repurpose existing conduit and grommets.

Will these bolt straight in, or do I need to modify the bumper?

They mount at factory points with no cutting or drilling needed. Test-fit the bezels first to confirm fitment with your bumper condition—if it's been replaced or heavily damaged, alignment may need adjustment.

Are bulbs included, or do I need to buy them separately?

Bulbs are not included. Check your owner's manual or the housing for the correct bulb type and wattage, then source them separately.