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@A_EF
I'm not sure you can judge what length you need by mine as mine is the one piece and looking at yours it might be one that would also work as a double, so may need totally different length BB.
I had the option of 115mm or 118mm (tange do good variety -- Sugino are more limited). I went for 115 as I figured I could space it out a couple of mm if needed with spacers on the BB which was preferable to putting spacers behind the sprocket if the 118 BB was too long.
Even measuring and calculating fairly accurately I still had to just fit the cranks to the BB I'd bought and work on what was in front of me with spacers to hand. Can be very difficult to calculate totally accurately without the parts in front of you, especially using second hand cranks.