Do these bolt directly to my truck with no modification?

Yes. They mount at the factory mounting points — no drilling, cutting, or custom brackets required. You'll need basic hand tools to remove the old units and bolt these in place.

Will I need new wiring harnesses or connectors?

If your truck's original connectors are in good condition, they'll work with these units. Inspect them during installation; corroded connectors can be cleaned or replaced separately if needed.

Are bulbs included, or do I need to transfer mine?

Bulbs are not included. You'll remove them from your factory headlights and install them into these housings — same bulb type your truck already uses.