My understanding is the tube diameter is the same where it plugs in the back of the machine, your biggest concern would be the width of the unit. Our 52 unit seems to be the same width as the l3 unit that we had on an M2, it seems to track in the same place in 6 row corn. The 60 and 70 units should be wider but I dont know how much, those machines are about 18" wider or so. Start with some hub face to face dimensions and make some phone calls, a standard 2wd axle may be narrower anyway cause the tires are smaller diameter and dont swing as far for tire clearance reasons in the back. If someone knows some of these dimensions pleas post them to help us along Thanks Gleamer
