I have old Tijicon night sights on my 17 and 19. I want to replace them but cannot identify their height. Can anyone tell me how to identify the height of these sights? These sights are dead on, so I want to get replacements right the first time. Also, has anyone used the Ameriglow Classics? If so, what was your opinion of them? I need night sights with a more open rear than the Trijicon. However I like the white rings too. Meprolights are my favorite size dots, but rear notch too small. Any suggestions appreciated.