Here's one web page I know of. Tell me if you want more or it works for you. Sorry I don't have alot of time right now, I just registered to be on here and now gotta go! Good luck!
Jamie has a good point. Unless you have hood vents or something it will just suck hot air, even then it's not as efficient. I have seen a few panel filters and there's another cheaper foam type one made by Perrin. Check it out at www.teaguesauto.com