The C39 has the standard shape and setup of a milled receiver with upper and lower stock mounting tangs. I am guessing that since there are tons more stamped receiver AKM variants than there are milled AK variants you are going to have a hard time finding an adapter or stock designed to just "bolt on".
I would recommend calling the individual companies that have stocks similar to what you want and ask if they have or intend to make a stock or adapter to fit the standard two tang setup of the milled AK.
Sorry I can't be of better help as I haven't seen what you are looking for.
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