I guess I should've posted my set-up over in this forum when I did mine back in March. On page 21 of the "tech tips/diy - custom mesh grille" thread you'll see my install of this exact mesh.
You can get the diamond woven wire mesh from customcargrills.com in an aluminum 12"x48" sheet. Here is the exact link: http://www.customcargrills.com/prodd...Woven_Wire_XXL
It's really easy to do and is by far the best aesthetic mod I've done to my WK. I did a write-up for the guy that runs that store if anyone is interest. He'll probably give a forum discount if you contact him.
Anyway, here's some pics...