Do these use the factory mounting points on my bumper?

Yes. These are designed to mount at the factory fog light locations — no drilling or custom brackets required. Test-fit before final wiring.

Does the switch wire into the factory harness or require a standalone installation?

The switch is designed for dashboard integration, but the specific harness connection method isn't detailed in the product specs — you may need to reference your Corolla's wiring diagram or consult a technician if you're unfamiliar with electrical connections.

What's the return process if the fit doesn't work for me?

Contact ModSupply customer service directly with photos or details — they'll walk you through the return or exchange options.