FWIW: When I was looking for my night sights, I wrote inquiring about PT NightSights for the CZ. J. Ling, IWI/MMC's Customer Service manager replied: "We do not make PT Night sights for the CZ". I do hear thay made some in the past, but that's what I heard when I went direct to IWI/MMC. I had contacted CZ, and they were out of the night sights (and had only offered 3-dots).
CZ's have a different, unique, front dovetail, which is parallel to the bore, and pinned by a 1/16th-ish pin.
Meprolights are good too. Kimber uses them on factory models (Millets too). Both Meprolights and XS 24/7's cost a bit more. I chose XS 24/7, since I wanted a smaller/finer front sight (The tritium tubes are the same size). Aim small, miss small!
I like the "i" sight picture very much.