NEW HEAT EXCHANGER WITH CLAMP Fits John Deere 50, 520, 530One New Aftermarket Replacement Heat Exchanger with Clamp for John Deere Two Cylinder Tractors This aftermarket replacement heat exchanger with clamp fits the John Deere 50, 520, and 530 two cylinder tractors. The heat exchanger mounts to the combined intake and exhaust manifold on these classic John Deere machines, routing exhaust heat to assist with fuel vaporization a key function on the all fuel and LP versions of these tractors. Part number