Does this come with a bulb?

No. The assembly itself is included; you'll need to source an H4 bulb separately and install it into the socket.

Will this bolt straight onto my car without modifications?

Yes. This assembly mounts at factory points — no drilling or bracket fabrication required. Existing wiring harness and bulb connectors align with the OE socket.

Do I need to seal or weatherproof this after installation?

Test the fit first. If gaps appear around the perimeter, a small bead of clear silicone at the mounting seams will prevent water intrusion. Most stock installations don't require it if the assembly sits flush.