soft lite window part needed

A home owner from St Louis MO says:
Can you identify the part in the attached picture?
Thumbnail of the uploaded file named soft lite window part.jpg
Profile picture of Casey
Casey from SWISCO responded:

Hey there. At first glance, your part resembles our 15-177 coil balance shoe. However, you will need to remove it from the window to be able to carefully compare your measurements with ours. 

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