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Quite a drastic fix for worn bearings, but bookmarked for future reference...
According to Wheels Mfg, the M570, M760, M765, m750, m752,m755 and m756 all use the same left and right cones, no info about the spacers and locknuts though, but gives me two parts to search for (and for someone else to find here via google).
Wheels Mfg CN-R097 and R098
Emyr
A German person reckons you can successfully assemble the 756A guts into the 756 shell, might only work if you also swap the freehub rotor:
http://www.mtb-news.de/forum/t/shimano-xt-fh-m756-jetzt-ungedichtet-hinten.590814/