I can't seem to find this part in your parts pictures.

A quick learner says:
Top of sliding sash sliding lock ?
Thumbnail of the uploaded file named window lock.jpg
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Paul from SWISCO responded:

Greetings. I am afraid that I was unable to locate your top tilt latch. We suggest removing the old tilt latch, reinstall the top side corner screw to keep the sash together and install top mounted tilt latches, the 26-314 black on top with a #6 pan head screw like our 33-089. Just be careful not to drill into the glass if you attempt this.

Replace an Internal Latch with a Surface Mounted Latch [1080p]
Replace an Internal Latch with a Surface Mounted Latch [1080p]
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Anatomy of a tilt window
Anatomy of a tilt window
VIDEO
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Styles of Tilt Window Latches
Styles of Tilt Window Latches
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