Front Drum brake troubles on a 1964 Dart

What centers the drum to the hub on these models? Does the drum flange fit into a machined recess on the hub......or does it rely on the bolts for centering.
Drums on these cars are hub centric. That's why when you cut the swedges off, it does not matter that the drums have a little back and forth "slop" on the wheel studs, because they are centered on the hubs.