Do I need fasteners or bolts to install this?

Mounting hardware is not included with this guard. You'll need to source bolts compatible with your factory grille attachment points—check your service manual for the correct spec, then grab standard fasteners from any hardware store.

Will this damage my truck's grille when I install it?

As long as you're mounting to the factory points, there's no risk to the grille itself. Test-fit first to confirm alignment before tightening down.

Does the chrome need any prep or sealing before installation?

The guard arrives chrome-ready and doesn't require priming or painting. Wipe it down with a clean cloth before bolting on. If you're concerned about stone chips on the road, you can apply clear protective film to the leading edges once mounted.