Do these bolt straight into my truck without modification?

Yes. These are engineered for factory mounting points—no drilling, no brackets, no fabrication. They drop into the OEM headlight position.

Are the bulbs included, or do I need to source them separately?

Bulbs are not included with these housings. You'll need to transfer your existing bulbs from the OEM headlights or purchase compatible replacements. The LED DRL strips are integrated into the housing.

Will these work with my truck's existing wiring harness?

Test fit first to confirm connector compatibility with your model year. If the OEM connectors don't match, an adapter harness is a straightforward solution—most part suppliers stock them for this generation Ram.