To answer your question I'd just watch E bay for said stock, but Alanint is correct, unless your Luger is an Artillery w/artillery stock, or Navy w/Navy stock, then you are asking for BATF trouble. And it ain't worth it.
And take it from one who knows, unless you pad the back of the stock, they really are not much fun to shoot with. That 1x4" surface seems to always find a bone in the shoulder to bang against even under relatively mild 9mm recoil.
dju
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