Italian cottered BB in a modern sealed unit? That's not something there's a lot of demand for. Nobody makes one AFAIK. I'm surprised Sunrace even makes a BSC cartridge BB.
Unless you want to pay a machinist to make you one custom, I think you're best off looking for a clean used traditional BB with good bearing surfaces.
Edit: I was going to suggest something like dedhed said, but i deleted it. Might work, might not. Lots of time and money spent if it doesn't. And it the end there is very little gained over a traditional unit.
I can't remember if French and Italian cottered BB spindles even have the same OD as British. If they're different obviously it won't work. Anyone remember or know? It's been decades since I worked on this stuff regularly, and I don't have a Sutherlands to look it up on, or any parts to measure.
Last edited by Salamandrine; 03-01-20 at 09:00 AM.