Alan,
I made my own grilles from stainless mesh, using 1/4 vacuum hose (slit lengthwise) as a gasket, and glued in place with black weatherstrip adhesive. It cost me about $50USD to make the radiator, brake duct, induction, and rear grilles. I made up templates, transferred the shapes to the screens, and began cutting. A Dremel and cutoff wheel (a few cutoff wheels) worked well for cutting the shapes. I'd guess that I spent 6 hours total, making and installing them.
There was some concern over a reduction of airflow, due to the mesh reducing the actual area of the radiator opening, but I never noticed any appreciable difference in engine temperature.
Check out this thread.
Stainless screen project
Bill