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@yoav
Seatpost bolts have quite long nuts so they fit a wide range of seat lugs widths. Such as:
https://www.sjscycles.co.uk/seat-posts/vintage-style-steel-seat-post-binder-bolt-16mm/
Also, it sounds like your Italian frame has an Italian threaded BB shell (70 x 36mm) so yes, you’ll need a BB with Italian threads.