Will these plug directly into factory wiring, or do I need a relay kit?

These come with an integrated switch designed to work with factory harness points. Most installations use the factory fog light cutout — no relay or additional electrical work needed. Confirm your vehicle still has the original fog light connectors in place before ordering.

Do I need to paint or prep these before installation?

No prep required. Amber bulbs are already installed and the housings come finish-ready. Mount them straight out of the box.

Can I replace just the bulbs later, or are they sealed in?

H10 bulbs are standard and replaceable. You can source spares from any auto parts store when the time comes.