Vintage spindles were asymmetrical. Modern cartridge BB typically use a thicker drive side cup to shift the whole assembly to the drive side. This accomplishes the same thing, more or less. IOW a similar spindle length is probably going to work, or at least partly work. Unfortunately crank design has changed slightly too. Try and fit is the only safe method. If the crank has decent clearance now, I'd probably risk it with a 115 and a couple BB spacers, just in case. Might need 118 though. Hard to predict. This is something I usually recommend people take to their LBS, unless you're comfortable buying at least a couple BBs.

I can't remember who made the Specialized bottom brackets. Think it was Sugino. They won't necessarily be to a modern JIS standard.