Hub vs flange mounted brake drum

rreegg

IDI n TDI
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Making the rounds looking at brake drums for '88 F250 w/ 3" shoes. I'm curious if anyone knows what the difference is between hub mounted and flange mounted brake drums? Looks like the flange mounted has a rectangular tab on the exterior but not sure what that's for, it kind of looks like a long wheel weight.

I have a hunch they're interchangeable but cannot find much anywhere explaining the differences - doesn't the drum just fit onto the lug studs?
 

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