Will this grille bolt straight onto my truck without drilling or modification?

Yes. This grille mounts at the factory attachment points—no drilling, no welding, no frame modification. Hand tools and about 15 minutes is all you need.

Does this come with fasteners or do I need to source hardware separately?

Grille assembly only. You'll use your truck's existing fastener holes and any hardware already in place. Check what you have before ordering to avoid surprises.

Can I install this before priming and painting, or should I prep it first?

Install first, then mask and paint. This way you avoid overspray on other truck parts and get a cleaner final finish. The bare surface is ready to accept primer immediately after installation.