Does this assembly come with a bulb?

No, the bulb is sold separately. You'll need to source a replacement bulb that matches your vehicle's specification.

Will this bolt straight onto my vehicle?

Yes — it uses factory mounting points with no drilling or bracket modifications needed. Just unbolt the old assembly and bolt this one in place.

What if the housing needs paint or refinishing before install?

Test-fit the assembly first to confirm fitment and alignment. If cosmetic finish work is needed, handle that before final installation.