drilled and slotted rotors

I have a 69 dart that has drums on front. I have a power disc brake swap from a 75 duster that im going to use. The rotors from duster are in bad shape. When i look up drilled and slotted rotors for 75 duster all i get is a drilled rotor with no hub assembly. But the non drilled rotors have the whole hub assembly. Anyone no where to find drilled rotors with hub assembly? Thanks dustin