Front brake rotors

Have to replace my rotors 69 Barracuda. These old rotors are Century made and both sides are 7/16 x 20 right hand thread studs w/small bolt at 11". Not sure if these hubs are Century or original, being that driver side is now right hand thread studs. Can't locate new rotors with hubs. Do I need to press of the hubs and just purchase the rotors and mate back together?