I was wondering if anyone knows what the original company that made radiators for the super 55. I have a youngs radiator that the guy I bought it from said was from a 550, which is what I needed it for. When I went to put it on a few weeks later it didn't fit. I checked with my original that had a hole in it and it was slightly smaller. I did some quick measurements with my uncles S 55 and they were the same. This radiator appears to be an original also with some green over spray on the housing.