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I think those are c body drums. I had a set on my 69 b body when i got it and they don't work with all aftermarket wheels because the face of the drum is recessed.
https://www.forcbodiesonly.com/mopar-forum/threads/finned-brake-drums-interchangable-with-regular-drums.64901/#post-1012758
I believe those are 66/67 b body identifed by the round hole in the brace. Also read you can easily combine those with a 68-70 automatic brake pedal assemby and turn them into 68-70 clutch pedals.