This doesn't look an internal tilt latch to me, even with that finger lever. It looks more like a surface mount tilt latch like the 26-243 and 26-244. Look over the dimensions to see if these match up. These latches lack that top lever, but honestly if they fit your window that won't make a difference.
I'm not sure if I understand, as the body of this tilt latch still looks like a surface-mount version that should slide in from the side. The top shouldn't really have any bearing in it. See the video below for details. If in doubt, please show me a picture of the slot where these latches fit into.
