there is no such thing as imperial and republican version of the chestpiece: http://www.torhead.com/item/c1G82g9/conquerer-hauberk <--- This is Dps version of the Chet Piece http://www.torhead.com/item/aRO9cnK/protector-hauberk <--- Tank Version of the Chest Piece. got them both on my Jugger Tank on The Progenitor, they are random drops from boss fight's on Flashpoint's SM (Battle for Ilum, FE, etc etc) I got both mine a while ago so i can't remember where exectlly it was but searching is worth it since u get a heavy chest with a hood that also look's very nice. Good luck hunting