Do these mount directly to the factory fog light openings?

Yes. These are designed for the factory mounting points on your Escalade—no drilling or modification needed. Test-fit before final installation to confirm alignment.

Is the switch harness included in this kit?

The switch assembly comes with the lights. Electrical connections to your vehicle's battery and existing wiring will need to be made manually—this is a basic splice job with a multimeter and butt connectors.

What bulb type do these use?

Bulb type not specified in the product details. Contact support with your VIN or check your current fog light bulb before ordering to confirm fitment.