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Any AK grip can be fit to the CZ. There are two ways:
Remove the grip plate from the receiver. All you need is the AK grip screw (I don't recommend this as it won't be as secure as stock configuration)
Take a CZ grip and place it against the top of the AK grip, outline the shape and cut a few mm recess into the grip with a dremel. Keep fitting until it is nice and tight. You will need the AK grip screw.