Will these bolt directly to my fender or do I need to drill new holes?

They mount at factory rocker points with existing holes — no drilling needed. Just unbolt the old markers and bolt these in place.

Do these lights come wired, or do I need to tap into existing marker circuits?

Wiring connection method is not specified — test-fit the connector before finalizing installation to confirm compatibility with your truck's OEM harness.

Are bulbs included with this kit?

Only the four light housings are included. Bulbs are not confirmed as part of the kit — source separately if needed.