Front Drum Replacement Help! Duster 340

1972 Duster 340 4 inch wheel, heres the problem. Where can I purchase the Drum with the hub, Oreillys auto tried to sell me a drum with no hub,,,,,,I need to get this car back on road, and I took my old ones and put it on a flip Im working.. The Drum has no hub in which they ordered for me? I am talking front drums....