Unique models and textures for all 7 Dagoth Ur's brothers.

AshVampiresReplacer.ESP - basic version
AshVampiresReplacer_GHD.ESP - if you have "Great House Dagoth"
AshVampiresReplacer_TTU.ESP - if you have "The Tribe Unmourned"
AshVampiresReplacer_GHD+TTU.ESP - if you have both "Great House Dagoth" and "The Tribe Unmourned"

There is also an optional model of Dagoth Nerevar for "Great House Dagoth" by TheMadGod. (It replaces the default ash vampire model used for the player by GHD transformation script.)