About one year ago, I purchased painted mesh aluminum covers. There were easy to attach and look good. I got them on ebay for about $35.00. I have seen them on ebaymotors since. You may want to try that site.
Went through ebay last night and didnt find anything. I am likely going to make them. I would like them behind the stock rad tunnel grills...in black; the centre: no choice. I also need the side vents; again behind the stock grills
I have look around for a while and am never able to get what I want.......!