Note that repro K43 and G43 stocks are still offered now and then, not sure of the quality though. But it may at least give your G43 an authentic again. You will also have the possibility to refit a proper (or repro) buttstock plate.
I see these stocks quite regularly on the Germanicon online marketplace Egun (www.egun.de)

For instance:

http://www.egun.de/market/item.php?id=5855396


There is also a guy offering repro buttplates btw
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