There's a common misconception that you can't use traditional ISO cogs (EAI, Dura Ace and most others) on Italian track hubs. Hogwash, we say!
You do, however, need an Italian-threaded lockring.
⚠️ This will only work on a hub having Italian lockring threads (ie: Miche, Campagnolo, Phil Wood).
• 1.32" x 24tpi left-hand Italian threads
• stainless steel