Freewheel threading on Miche flip-flop hub
I have these hubs, I used a normal freewheel (1.37&quot; x 24TPI) I had lying around from my old single speed build.
I'm 99% sure you also need a normal single speed / BMX / trials freehub. The 1% doubt I have is, that I don't know which model/year your hub is. And I don't know if they ever did a different one.
Worst come to worst, buy a freehub from a place which does refunds easily. That way, you can try to fit the freehub and if it doesn't fit, just get your money back.