It's the white part and the lock

A quick learner from Alpharetta GA says:
It broke off the bottom part with the lock/rail
Thumbnail of the uploaded file named D5859396-5864-48E9-8792-FDB5DDD02150.jpeg
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Paul from SWISCO responded:

We'd like for you to take a look at our 15-251 inverted single support, along with the S160-10 coil spring. Let us know if you could use these parts to repair your window.

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