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@Scilly.Suffolk
You know you need an Italian BB, so that narrows it down to two: pre-'78 is 113mm and post-'78 is 115.5mm.
Which one you need is dependent on the front derailleur: post-'78 the derailleur was wider, hence the wider BB.
These do crop up on eBay quite regularly (there are a couple on there at the moment), failing which 115.5mm is the current triple BB so they are available as cassettes.
I'm not sure that 113mm has been used for other groupsets, so I don't know what alternatives are available