850 front pulley hub

I need to replace the hub and shaft that drive the front hydraulic pump for the loader on my 850. All the hubs listed for an 850 show a distance of 2 3/4" between hole centers. Mine measure 2" even. Do I have an oddball or are they measuring diagonally across the hub instead of neighboring holes? Thanks in advance.
 
In this context, bolt hole locations are most likely based on the diameter of the circle they fit.
 

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