Will this headlight bolt straight onto my Grand Cherokee without modification?

Yes — it mounts at the factory attachment points. No drilling, grinding, or custom brackets needed. Basic hand tools and about 15 minutes gets you there.

Does this assembly come with a bulb installed?

The assembly ships without a bulb. You'll need to source your own replacement bulb to complete the install — check your owner's manual or parts counter for the correct type.

Can I paint or modify the black housing if I need to match trim or customize it?

The black housing is solid and can be sanded and refinished, but test any prep and paint method on a small area first. Standard automotive paint and primer work on hard panel plastic — just make sure the surface is clean and slightly roughed before application.