Will this bolt straight to my truck without any modification?

Yes — it mounts at the factory attachment points. No drilling, cutting, or brackets required.

Does this come with the H13 bulb installed?

The assembly ships ready to mount. You'll need to install an H13 bulb before turning on the headlights — it's not included, but any H13 from an auto parts store will work.

Can I paint or prep this before installation?

This is ready to install as-is. If you want to customize the housing, remove the bulb and lens first and handle the exterior hard panel however you want — just test-fit it back to the truck before final mounting.