It's the white part and the lock

A quick learner from Alpharetta GA says:
August 5, 2019
It broke off the bottom part with the lock/rail
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Paul from SWISCO responded:
August 11, 2019

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.
10 lbs Series 160 Coil Balance
10 lbs Series 160 Coil Balance
S160-10
$6.34
Inverted Universal Single Support
Inverted Universal Single Support
15-251
$3.97
How to replace a window coil balance
How to replace a window coil balance
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How to Replace a Triple Coil Balance System
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Removing a Triple Coil Window Balance
Removing a Triple Coil Window Balance
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