Channel window balance

A contractor says:
Not sure if part numbers. . Thank you
Thumbnail of the uploaded file named 25 5 Stamp
Thumbnail of the uploaded file named Pivot Shoe
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Lauren from SWISCO responded:

Hello, thank you for posting,

For the channel balance, to further review, are you able to provide pictures of the top and bottom of the channel where we can see any attachments? 

Please start by reviewing the style and dimensions of the 15-121 pivot shoe below to see how it compares to your original for a good fit! 

Alternate image for 15-121
Alternate image for 15-121

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