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Are these the ones with non-standard mounting brackets for the stock?
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They used the Polish/Milled double tang. Standard for most milled AK's.
You can find stocks for them at Kvar in varying lengths.
Attaching a folding/collapsible stock on the other hand, is a pain in the ass.
You can use the Tapco AR tube, but you'll have to either remove the lower tang, or possibly dremel/file out a slot for the tang in the bottom of the polymer adapter. Some have had these adapters fit without modification, but YMMV.
For most other kinds of folding stocks, you'd have to remove the lower tang, or both tangs. Same kind of stuff you'd go through with a regular stamped AK in regards to folding stocks.
Just my opinion, the dual tang makes sense. It makes the stock more rigid and will keep it that way for longer. For most people getting an AK at those prices, they aren't going to modify it a great deal.(I'd want the polymer to have a Warsaw length stock, but that's me) Also, removing the lower tang to add a folding stock isn't very difficult. And as long as you have a stock on it, its value won't drop much, if at all.(It's a sub-$700 rifle anyway. Plus a folder will increase the value a bit)