It looks like you show this part in your YouTube video. It has l 4 on the bottom of the part
Bob from SWISCO responded:
September 3, 2023
Thanks for posting. This is an internal tilt latch that I am afraid is no longer available. We recommend seeing if you can convert your sash to surface mount tilt latches, like our 26-228 & 26-229 or 26-193 & 26-194. See the video below which explains this conversion process.