Shimano Octalink BB axle width/length

[mhespenheide]

So...

I'm trying to resurrect my first good bike, a 1990 Bianchi Campione d'Italia. It was a mutt in the first place, with a lugged Columbus Cromor frame welded in Italy and a smattering of Ofmega, Cinelli, and SunTour parts. As a fan of Andy Hampsten and the 7-11 racing team of the day, I developed a fondness for Dura Ace parts. I've managed to collect some mostly-period-correct 7400 through 7410 series parts, except for a set of 7700 cranks. They're in the difficult-to-find size of 177.5mm, so I'm fine to put up with the variation. (Especially since this is a sentimental project more than anything else, not a restoration). I now need to find a bottom bracket for the 7700 cranks. The trick is that the Bianchi uses Italian threading on the BB shell.

In searching on google, it looks like the only "new" options for Italian threading are 70x109mm or 70x118mm. Am I correct in assuming that the shorter spindle is a generic "double" crank and the longer is a generic "triple" crank, or do I need to look at any other issues such as chainstay clearance?

Also, it looks like there were two different versions of the octalink. Yes? No? It looks like this fits the 7700 cranks.

(If anyone has a good-condition appropriate bottom bracket for sale, let me know...)

Thanks for any help,
Mark.