Do these mount at the factory fog light locations?

Yes. These mount at factory rocker points — no drilling or bracket fabrication needed. Test-fit before final fastening to ensure alignment.

Does the switch wire directly into the existing dash harness?

The switch and harness are included, but integration into your vehicle's electrical system depends on your comfort level with wiring. If you've tapped into factory wiring before, this is straightforward. If not, a qualified shop can complete the job in under an hour.

Can I paint the housing if I want a different finish?

The housings can be prepped and painted, but the smoked lenses are not painted — they're molded. Mask them off before any finishing work.