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It looks like these drums are not longer being made in the aftermarket. Original drums can be relined by companies like JG Brake Drum Relining and Refurbishing but it is not cheap. Since yours is busted, your best bet is going to be one of the wrecking yards
I hated to but I just switched rear ends with a 73 that I had. My 59 was all original but it had a busted drum and one of the wheels was bent and someone had welded the ring on it. It just had to many strikes against it.