What is the size of the socket needed to undo the fork filler Bolts?

Can't be exact, but I use whatever Metric/Whitworth/AF size seems to fit. With a nut that large, an exact fit doesn't seem too critical.
 
In metric it is oddball at a tad over 33 mm (34 mm would be a poor fit on a 12 point)
Regarding that, it was easier (for me) to machine a 6-point socket from 6061 for a couple of dollars with an optimum hex fit.
 
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