What Jason said. Due to the confusion of what is the scale of the bass and the scale of the string, the best thing to do is as Jason suggests: measure from the string anchor to just above the nut, note that measurement, then contact Jason to ask him what strings will fit the bass.
And as the article explains:
A "short scale bass," meaning a measurement of 30 to 31 inches from bridge saddle to nut, will probably need a string with about a 32 inch winding on it, in order to clear the anchor and the nut.
But 32 inches is usually considered a "medium" scale for basses from bridge to nut, and may need a 34 inch string.
It gets better: with string through basses, more is needed.
And with some basses, like the Harmony H22 and reissues, the tail anchor is so far down that even though the instrument has a "short scale," meaning 30 inches from bridge to nut, they use "regular" strings made for 34 inch scale basses.
So...as Jason says, the key measurement is from the anchor to the nut, and let Jason help you get the correct string.