Hmmm...production division has a maximum size.
Not sure if your extended magazine will make the gun too big? Though I'm not too familiar with the CZ line. The rule is odd considering the fact that you can only have 10 rounds in each magazine at the start signal for production division.
I'm sure jthhapkido will be along any second to explain. 3...2...1...
Did I hear my name?
They didn't want people putting weighted extended base pads on their magazines, among other things. Originally in Production you had to use magazines that matched the factory profile for the gun. Which, among other things, meant that while you could shoot a G26 in Production, you couldn't use G19 or G17 magazines in it----however, this has since changed.
Now, you can use aftermarket magazines and basepads AS LONG AS they fit in the USPSA box, which as Fly said, is 8 15/16” x 6” x 1 5/8”.
Looking at the picture, I also think that +2 basepad is going to be too big. The standard basepad for the CZ, if I recall correctly, barely fits. Not positive---but I bet when you measure it, it is going to be too tall.