Will this bolt straight into my car without any adapters or brackets?

Yes. This assembly uses your factory mounting points directly. Just align it, bolt down, and connect the wiring harness.

Does this include the bulb?

The assembly comes as shown; confirm bulb inclusion before checkout if that's critical to your install.

Is any prep or painting needed before installation?

No prep needed. The black housing comes ready to bolt on. If you want a custom finish down the road, you can handle that after install.