use an eai cog and lockring! (or phil, or campy)
they're really nice quality (best quality) and they're made to work with your hub..
the dura-ace is not the right threading, although you might be able to fudge it (but why?)

record hubs have the globe logo on the barrel and are stamped 'record'
early hubs have the globe but were not marked record
hubs are stamped with a two digit date on the locknuts
high-flange hubs have often copied oval cutouts
true track hubs do not have oil ports and hence no steel spring clip cover on the barrel

c-record hubs have the funny lump on the barrels
high-flange hubs have distinctive updated flange design ('sheriff star')

cool hubs!