All you need to do, is fully enclose the casing around the air filter - the bottom and the back. On the back piece weld a piece of pipe say 2", drill a hole in the grain tank so this will pass through it, mount a donaldson pre-cleaner up above the grain tank (position varies if you have a big top) put a piece of hose between the two, seal up where the air box passes through the grain tank and there you have it - a pre-cleaned cab filter. Any questions? - ask away.