Snap in sash

Hello there. To clarify, the 'sash' is the movable part of the window with the glass. What you are showing is surface levers for internal tilt latches. Tilt latches are what you activate to 'tilt' the window sash inward. Internal tilt latches have been phased out in the modern era and are hard to source replacements for. I think you may be be better off converting your window sash to use surface mount tilt latches like the 26-228 and 26-229. The video below shows how to do this. Review and look at the tilt latches to see if you think this could be feasible.