Will these bolt straight onto my truck without modification?

Yes. These mount at factory rocker and housing points — no drilling, welding, or adapter brackets. Bolt them in and you're done.

Do I need to remove the front grille or bumper to install these?

Access varies depending on your specific truck setup. Most drivers remove the grille for easier mounting bolt access, but it's not always required. Check your service manual or test-fit first to confirm your particular routing.

Are bulbs included, or do I need to source my own?

Bulbs are not included with this assembly. You'll need to transfer your existing bulbs or purchase replacements separately — check your owner's manual for the correct bulb type and wattage.