Has anyone installed these? https://shop.cz-usa.com/ProductDetail/0721070017_Suppressor-Ready-Night-Sights-3-P07p09 There is almost no information in the description at the CZ-USA store. Are they Tritium? And there are three different numbers listed (2,3, and 4) as different models, but no description about what the difference might be. I'm assuming height, but there are no heights listed either. Anyone?