Do these mount at the factory fog light holes?

Yes, these mount at factory rocker points with no drilling needed. Line them up with the existing holes and secure with the mounting brackets provided.

What about the wiring harness and bulbs?

Bulbs and wiring harness are not included. You'll reuse your existing bulbs and harness from the OEM fog lights, or source a compatible upgrade separately based on your vehicle's current setup.

Can I paint these before installing them?

The clear lens is meant to stay clear—painting would kill light output. If you want painted surrounds or trim rings to match your bumper, source those separately and test-fit before committing adhesive to the light body itself.