Do I need to buy fasteners separately, or does this come with everything?

The guard assembly ships as-is. Fastener kit not confirmed — verify your vehicle's factory mounting hardware before install, or source a bolt kit separately if needed.

Can I bolt this on without modifying my bumper or frame?

Yes. This mounts at factory points, so no drilling, cutting, or welding required. Install is bolt-on.

Does this need primer or paint before I install it?

Finish not specified. Test-fit first, then decide whether to paint it to match your bumper or leave it as-delivered. Either way, let any finish cure fully before driving.