i think you can fit 105 10sp and ultegra but i'm not definate on the dura ace, haven't tried, the freehub body on dura ace hub is slightly different, shimano trying to force you into buying the cassette aswel as the hub. i'm sure that wherevever you get them from they will let you slide one on to see first, if it doesn't fit, run the ultegra you won't notice any difference.