[G.M.]

Find a fan The same OD, same number of blades with the same pitch angle and have a machinst drill the 4 matching holes to the adaptor. I doubt whether pushing the air forward would matter in your tank if the blades the were at the opposite pitch and may be better if it pushed the air out through the front air opening. The interior will be a lot cooler. You don't get air forced through the radiator from forward motion at the speeds you travel. Ford made pusher blades for slow moving tractors so they wouldn't pull debree into the radiator. You put a fan like the one in the picture on and with the new radiator if it has more capacity than the old one your problems are over. G.M.