Do these come wired and ready to plug in?

The housings arrive with bulbs installed. Wiring harness and connector type depend on your vehicle—you'll need to verify your factory fog light plug or source a universal harness to match your setup.

Will these fit my bumper opening?

3.5-inch round housings are the most common universal size, but test-fit is critical. Measure your existing bumper fog opening or mounting area before ordering—some vehicles have oblong or oversized openings.

Can I use these with my factory wiring?

If your vehicle had factory fog lights with the same connector, these will bolt in using existing harnesses. If you're adding fogs to a car that never had them, you'll need a relay kit and dedicated switch—standard for any fog light retrofit.