• Just been through all the archived spec PDFs:

    HB-M678 is listed as 32 or 36h in the 2012-2013 specs, but a lot of places seem only ever to have stocked the 32h version.

    The specs for 2010-2011, 2009-2010 and 2008-2009 list both HB-M778 (Centrelock) and HB-M758 (6-bolt).

    Before 2008, 15mm thru axles didn't exist yet according to Shimano.

    So I'm probably looking for hubs delisted 6 years ago or 4 years ago, in a hole count that was unfashionable even then.

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