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

Yes. These mount at factory cab light locations and connect to the existing harness — no rewiring needed. Install and wire like you're swapping out the OEM unit.

Do I need to remove the headliner to install these?

Mounting method depends on your truck's interior access. Test-fit first to determine whether you can reach the factory location from inside the cab or if headliner removal is required on your specific year.

Are these bulbs replaceable, or is the whole light assembly disposable?

Assembly design not specified — contact our sales team with your truck's year to confirm whether LEDs are user-replaceable or if the entire housing needs swap-out when the bulb reaches end of life.