Do these connect to the factory wiring harness or do I need additional wiring?

These use factory mounting points and the integrated switch connects to your existing fog light circuit. No additional harness or relay work needed if your vehicle came with factory fog lights or a compatible wiring path.

Will the smoke lenses work with HID or LED bulbs, or do I need standard halogen?

The assembly accommodates standard bulb types. Check your owner's manual for the correct bulb specification and wattage before installing aftermarket bulbs to avoid overheating the housing.

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

Contact ModSupply directly with photos and details about the fitment issue. We'll work with you on a solution or return options based on the condition of the assemblies.