There are a few genuine DFC heads still around, mainly blue though, the cheaper alternative would be to buy the parts and rebuild yours, from memory the Dominator had the standard DFC head and 112mm shaft.
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This is the Align 450DFC Main Rotor Head Upgrade Set and is intended for use with the Align T-Rex 450 Pro, 450 Sport and 450 Sport V2 helicopters.... AGNH45162QN