That's a strange coincidence. The piece of material that I purchased to do the grille on my '97 a few weeks ago was a 6"x48" flat black powdercoated sheet for $14 from the "scrach and dent" section. Hopefully that's a
different piece than the one I bought, rather than a delay on the owner's part in updating his online inventory list.
That size a piece is just the right amount to do one of these, but be careful cutting, because there is no room for error. Gotta love that "scrap pile".
There's lots of ways to do it, but I didn't want any hardware showing at the front of the grille, so what I did was buy some of these:
Then I removed the white adhesive tape from the backs, and used a dremel tool with a cutting wheel to rough up the back of them. Next I went around the inside lip of the grille and roughed it up in 14 spots...
Then I used plastic welder (a type of epoxy) to permanently attach the mounting bases to the inside of the grille. Last, I left at least one row of perforated holes on the grille material extending past the inner lip of the grille. I used 8" zip ties looped through those holes, and then through the mounting bases. It is a very secure method of mounting the grille material, and it's completely invisible from the outside.
I guess a picture is worth 1,000...