Your target axle would be a Stronglight
"125" axle for a model 99 Triple crankset. Dimensions are:
30.25 mm Left - 56 mm Center - 39.25 mm Right [for an actual length of 125.5 mm]
The
Specialites TA #374 triple axle is close:
26.25 left - 56 center - 39.25 right
So, only the left side crank arm would be drawn 4 mm closer to the BB cup - which should be fine so long as your crank arm tapers are not excessively worn.
Your closest
Campagnolo axles would be:
...a
"Record"...
ITALIAN Triple... from post-1977 to early 1980s.
It would be marked
70-SS-120 X3 (+1.0 +1.5) or simply
70-SS-X3... Dimensions are:
28 left - 56 center - 38 right
... a post-1977
"Gran Sport" triple axle (with a black Oxide finish), also
Italian and marked
70-SS-X3 - dimensions:
30 left - 56 center - 38 right
However, Campy triple axles are SUPER rare, were made only for the very rare Campy Triple cranksets which were produced in fairly low quantities and now replacement axles are in ever increasing demand and continually sought. When/if they are found, they are either in very bad condition or you better have a lot of cash on hand. Remember too, Campagnolo
Never made triple axles for their thicker NR cup sets, only for the thin walled Record cups. So if you have thick walled Sugino copies of Campy's Nuovo Record cups... yer outta luck.
The TA Professional 5-vis "Cyclotourist" triple touring cranksets were made for 50+ years, always used the same axles, and millions were made. So these may be your best bet, or most likely find.
