Air outlet for bonnet

I’m looking for an air outlet for my bonnet at the moment. I looked at something with an older Skoda and then I looked at a sprinter. I like that even better. So I want an outlet where I put in a plastic insert and therefore no hat or similar on it, because that is ugly. Do you have any other types where I can find something like this? Here are some pictures: Sprinter:http://www.webster.net.pl/…/mercedes_sprinter_sklejka2_01.jpg S koda:http://cars.avto.ru/…/…_d92be62cda274fb69bd530d95caf74b8_1_big.jpg My hood is not very curved and therefore wants to have a few variants so that it doesn’t look too set up and also because of the width. Because of rainwater I probably want to put it so that it doesn’t drip on any hot parts when I stand. During the ride this shouldn’t be the problem, I hope. I want to achieve a better ventilation of the engine compartment because the heat is behind the engine on the turbocharger very staut…