Will these mount at the factory fog light locations without modification?

Yes — these are designed for factory mounting points. They'll bolt in where your original fogs sit. No drilling, no custom brackets.

Does the switch mount under the dash, or do I need to run new wiring?

The switch is integrated and ready to install. You'll connect it to your vehicle's existing electrical harness at the fog light location. If wiring harness routing is unclear, reference your service manual for the exact connection points.

Can I return these if they don't fit my specific vehicle?

Test-fit the housings in your fog openings before final installation. If fitment is off, document the issue with photos and reach out to ModSupply customer service with your order number — they'll walk you through return options.