Oetinger is known to help out when they can as they flow mold their abs stuff if they still have the mold they'll probably charge the normal price...but chances are they've repurposed the molds as that is what they do. And in that case your best solution will be the aftermarket ABS mesh that can be cut down to size and heated up to fit perfectly... (if you've never molded ABS before, it's best to have that done by a bodyshop, or buy extra as you'll probably will mess it up at first, the metal stuff is easier to shape and can be reinforced with a metal frame and welded together ( that's how Kamei used to make their meshed sport grills) than paint the lot black to match...
last time i made a mesh grill from metal I went the Kamei route... it gives so much more of a quality look to the end product. especially if you make nice little tabs to secure it on the inside and make them thick enough so you can tab a thread into them and use simple bolts to secure it in place.