Help needed! Stock drum? studs on drum? off of different car? 1972 swinger

So basically i suck at finding out these sorta things on my own. These are 9 inch front drums 5x4 bolt pattern from my 1972 swinger that i want to possibly buy replacements of was gonna do a disc coversion but gonna need to wait awhile. but i dont know where to find these drums and if they are even what came with the car. Also confused to why the studs are on the drum and not on a hub is this normal? And if i cant find this drum or a similar drum can i replace the studs on it easily because they are loose. any help would be appreciated. pictures are below.

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