I don't know the exact spacing at the bridge. Though I can tell you that it definitely feels wider than any of the previous American standard jazz basses (at that point there wasn't a P-bass to compare with).
I am familiar with the Fender Roscoe Beck Jazz V. It has bridge spacing that is very similar to that of a standard jazz 4 string. The new P-bass V feels just as comfortable as the 4 string. I would guess with the newly designed bridge, it is within in mm's (really close) of the 4 string counterpart.
For the specific mm, I would directly call or email Fender.
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