Not sure but along with length, it might also come down to whether the crank you want to use needs a symmetrical or non-symmetrical spindle. Some of the C record era Campy cranks had symmetrical spindles. At least I l know the two 1st gen Chorus cranks I have, uses such....
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72 Line Seeker
83 Davidson Signature
84 Peugeot PSV
84 Peugeot PY10FC
84 Gitane Tour de France.
85 Vitus Plus Carbone 7
86 ALAN Record Carbonio
86 Medici Aerodynamic (Project)
88 Pinarello Montello
89 Bottecchia Professional Chorus SL
95 Trek 5500 OCLV (Project)