Do these bolt directly to the car without modification?

Yes. These mount at factory headlight points with no drilling or cutting required. You'll need to remove your old headlights and swap in the new assemblies using existing fasteners.

Will the projector bulbs need replacement right away?

These are brand new, so bulbs are fresh. Over time—typically 2,000–3,000 hours of use—bulb replacement will become necessary. Check your service manual for the correct bulb type and wattage for your specific model year.

What if one headlight doesn't light up after install?

Start with the bulb—verify it's seated correctly and not burned out. Then check the wiring connector for corrosion or a loose pin. If the issue persists after those checks, test the headlight on the other side to confirm the assembly itself isn't defective before reaching out to support.