What size is my rear brake drum?

Thanks for the replies from all! After a long time delaying 2 years and finally fighting with lock lugs (missing key) I found myself scratching my head when I expected small 9” drums under the wheels and then saw these big things.
So what parts do I replace with? I plan on ordering online. Do I look at B or E body V8 brakes? Any particular model? The drums I removed had Chrysler logo embedded in the cast iron.