question bout custom grilles

ok hey guys...havnt posted in a while..well today me n my friend decided to go to home depot to get that material for grilles...we took a while just cutting n bending to fit just right in so now we have a perfect fit but the problem is how do we keep it in...its for the bottom mouth part in the center of the bumper...any ideas would really help thanks guys!!

I found a site where the guy used black wire ties.