Will these fit directly into my factory fog light housing?

Yes — these are direct replacements designed for factory fog light cavities. No drilling or bracket fabrication needed. Test-fit before final installation to confirm sealing.

Do I need a wiring harness or relay kit to run these?

LED fog lights pull significantly less current than halogen units. Your factory wiring can handle them in most cases, but if your vehicle has a load-sensing module or automatic headlight control, consult your service manual to confirm compatibility before installation.

What's the return window if they don't work with my setup?

Confirm fitment and compatibility with your vehicle's electrical system before installing — once wired in, returns are subject to restocking. Test on a bench or with a multimeter first if you're unsure about your wiring.