I have a 05 xterra and just pick up the OEM front grille guard off a 06 I think it suppose to fit, but I have no idea how to put on the upper support brackets and where to drill the hole in the bumper... does anyone have instructions on how to install the front grille guard? thanks!

I'd get your money back. If you had searched grille guards in this forum, you would of found lots of talk that was negative. Grille guards are the most useless items you could buy. For a little more money, you can get a nice winch bumper, even if you don't want a winch, to protect the front end lots better. A grille guard will wipe out your fenders, hood, plastic grille in a heartbeat if you nudge into something. Check out Shrockworks. I think Jim has one for the 05' Xterra. Trust me on this man.