I guess I am confused then - because Sheldon Brown's site says ISO headsets work on Italian threaded forks.. I just googled it again and Velo-Orange even says the same thing:

"Italian headsets are virtually the same as ISO. The crown race ID is 26.5mm rather than 26.4mm and the threads are a tiny bit different, but ISO headsets are so close that they work absolutely perfectly on Italian frames."

AND - how do I find an "Italian" headset - especially in black! LOL

Thanks everyone!