Do these bolt straight into the factory headlight buckets?

Yes. These mount at factory points with no cutting or drilling required. You'll need to disconnect the OEM connector and set these in place, but the buckets stay exactly as-is.

Are bulbs included, or do I need to source them separately?

Bulbs are not included. You'll need to source replacements when the LED elements eventually need servicing—confirm exact bulb types before ordering to avoid compatibility issues.

Will these work if my car is still running the factory wiring harness?

Factory wiring harness compatibility depends on your model year and existing electrical setup. Test-fit the connector before finalizing installation; you may need an adapter or minor harness work. Check your vehicle's service manual or reach out if you're unsure about your specific configuration.