I have the MP crossram also. I need to measure, but I am thinking of trying to fabricate a base out of aluminum that would let you use the six pack filter and lid,diagonally of course, if that works, take it to Paint it Black and get him to do them in fiberglass for a resonably priced, somewhat factory appearing air cleaner. The other plus would be that the K&N sixpack filters are available in 3" to better match the flow capabilities of the Holleys.