According to Sutherlands, a 70-SSA is a Croce d'Aune spindle, and it is indeed symmetrical (30-51.5-30mm), made for use with 1/4" balls, and thick rifled cups. So, wrong spindle for a NR, which would be asymmetrical (31-51.5-33, marked 70-SS normally).

This is a pretty good link for Campy NR/SR stuff, but doesn't cover the newer ones:
http://www.minortriad.com/campagbb.html