You might try
www.f150online.com/ for this. Personally I"ve never seen one or heard of one but I wouldn't mind knowing either. Eaton and Kenne Bell are a couple blowers that could be used. MM&FF just did a test between the Eaton and the Kenne Bell and proved that the screw drive design of the Kenne Bell works better than the roots type design of the Eaton. Interesting article.