Do these need bulbs installed, or do they come with them?

Bulbs are not included—you'll reuse your existing bulbs from your factory headlights. Check your owner's manual for the correct bulb type before you remove the old lights.

Will these work with my factory wiring harness?

These are designed as direct replacements, so they connect to your existing factory connectors without rewiring. No adapter harnesses needed.

Do I need to paint or prep these before installing?

The black housing comes ready to install—no painting or prep required. Install them straight out of the box and you're done.