Do these bolt directly to my car without modification?

Yes—they mount at factory headlight points with no drilling or bracket fabrication needed. Just disconnect your stock headlights and plug these in.

Are the LED bulbs included, or do I need to buy them separately?

The housing assembly comes complete with the LED DRL circuit built in. You'll need to supply H4 or equivalent projector bulbs for the main beam; check your vehicle's original spec before ordering bulbs separately.

Will I need to adjust or aim these after installation?

Aiming may be necessary to match your vehicle's original beam height—most projector headlights require a quick adjustment at the factory aim screws to prevent blinding oncoming traffic. Refer to your service manual for the correct procedure.