Does this require wiring into the vehicle's electrical system?

Yes. The switch connects to your van's power and ground — you'll need to run wiring from the battery and chassis ground to complete the circuit. If you're not comfortable with electrical work, have a shop handle it.

Will these fit in the factory fog light holes?

These mount at factory locations on your van's bumper. Test-fit the bezels before committing to final wire routing to ensure everything seats properly.

Can I return these if they don't work with my setup?

Contact ModSupply customer service with photos of your fitment issue and any error details. They'll work with you on next steps.