Per Michael Eagleshield, CZ's Gunsmith, the incorrect firing pin can be identified as follows:
Disassemble the gun and remove the bolt. Turn the bolt upside down so you can get a good look at the firing pin.
The "Bad" version of the firing pin is tapered. It is fairly obvious to see with the naked eye.
The "Good" version has no taper and is the same diameter from beginning to end and is shouldered down at the end where it strikes the shell primer. You will not be able to see the shoulder unless you disassemble the bolt.
I identified this by calling CZ and they walked me through the above. CZ sent me the correct firing pin and an extra "O" ring as well, this took about two weeks to ship to me.
Taking apart the bolt is a little tough as the keeper pin is a bugger to get out. But I followed the gunsmith's instructions and was able to complete this myself.
All is working well now, and I have a piece of mind that I should not expierience a firing pin failure.
