As stated in the link posted by smieglitz, the 600SE does NOT take any of the Mamiya accessories or lenses. In their own infinite wisdom, the folks at Polaroid changed the attachment system just enough so that you have to buy an adapter to fit any of the regular Mamiya backs on the camera (the Four Designs adapted M adapter, mentioned above.) I don't know how you could cobble the lens mounts - perhaps by putting new cells in the shutter you have? The mounting system is, again, just different enough to not fit. These are indeed nice cameras, and with a little machine work or a purchased adapter, they can be flexible, but I just use mine with Fuji pack film and call it a day.
Huh, i was told it was just a super 23. What a bummer. Does the adapter screw off of the body like it does on a universal or press?