I did too!
Mike, I upgraded mine a couple of years ago with no problems. The specs were the same for both units. The only thing that O had to do was place a halyard retainer on the mast to lower the angle of the halyard coming on to the swivel to prevert "halyard wrap".BTW, call Hood for any exchange deals (www.pompanette.com). They sold me just the head and I was able to use the same extrusion and swivel. This saved a lot of money.