Do these mount at factory bolt points or do I need to drill?

These mount at factory rocker and fender attachment points—no drilling needed. You'll use existing holes on your truck.

Will these lights work without rewiring or do I tap into existing marker circuits?

Installation details are not confirmed in the product specs. Your truck already has marker light wiring at the corners; test-fit the lights first to verify connector compatibility before committing to any splicing or adapter work.

Can I return these if they don't fit once I open the box?

Returns are handled through ModSupply's standard return process. Since these bolt to factory points, verify fitment by comparing the mounting tabs to your truck's existing holes before installation.