I have one if you want it... (have to look in my spare parts bin to make sure).
Don't think the CZ had an "OEM" black grip, the one I have is the FAB grip with screw which is the one I've seen them sold with, back in the day.
PM me, might give it to you for $5 + shipping. Also have a Hogue AK47 grip that I hacked up a little bit (have to alter it to fit), can have it for free if you want to goof around with it (AS IS). PM me if interested.