Maybe you can find someone with old stock. A few years back I bought mopar nos ones off ebay. Maybe if not nos, then look for old stock bendix or something like that.
Here is a example. https://www.ebay.com/itm/Mopar-10-X-2-1-2-Heavy-Duty-Finned-Brake-Drums/292855043932

You may have to put in some search time but you probably can find some out there. It isn`t easy though.