Do these use the factory fog light holes?

Yes. These mount at factory points — no drilling or custom brackets needed. Test-fit before final installation to confirm alignment.

What about wiring and the switch — do I need extra parts?

Everything comes in the box: the harness and switch. You'll just need basic hand tools and a socket set for fasteners.

Are these plug-and-play, or do they need to be wired into my existing electrical?

The harness and switch are included, but routing and integration into your vehicle's electrical system depends on your comfort level. Consult your service manual or a qualified tech if you're unsure about running new circuits.