Do these use the factory fog light holes?

Yes. These mount at the factory fog light mounting points—no drilling or cutting required. Test-fit the bezels before final assembly to confirm fitment with your specific bumper condition.

What about the wiring—do I need to tap into the existing harness?

The kit includes a complete harness and switch. You'll need to run the harness to your battery and ground, then mount the switch in the cabin. Basic hand tools and a fuse holder are all you need; refer to the included wiring diagram for routing.

Can I swap out the bulb for a different color?

Yes. The kit uses a standard H11 socket, so any aftermarket H11 bulb will fit—just confirm the voltage matches your vehicle's 12V system. Keep in mind that non-amber or extremely bright bulbs may not be street-legal in all jurisdictions.