I just installed my new front grille from courtesy Nissan. I was really disappointed with the brackets provided with it. The grille is supposed to be attached with some tex screws to the plastic scoops on both side of the bumper, and those plastic scoops are affixed to the car using plastic clips!
Instead, with the help of a friend, I designed some aluminum brackets, that were powder coated in black to blend with the rest of the hardware. The custom made brackets bolts, on the top, to the aluminum stud of the car and, on the bottom, to the bumper. The installation was a bit tricky but the result is really nice. The attachment feels really solid and strong.
You can check some pix of the installation here:

Loic's 350ZR Grille installation page

 

Correction, I did not buy this grille from courtesy.....I bought it on Ebay and I can't remenber the brand.....

 

How do you get the tow hook in there? I could not see if there was enough room for it to fit in between the ribs of the grille.

 

The grille (and the licence plate) would have to be removed (4 bolts for the grille)