I talked to H9 and they said the tank they gave me should work. I like the idea of just running the hoses through the firewall.
I was looking at one of my other planes, a Global Fokker D-7 and the tank from it is the right design but just a bit to big. I'm calling Global to see just who makes that tank and try and get a smaller one...easy right. LOL
If that doesn't work then I can use the information and make one of my other tanks work then....thanks for the help!