What type of channel is this?

A contractor from Boston says:
May 1, 2017
Any clue by any chance?
Thank you
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
May 3, 2017
Sure, this looks like our 15-087 pivot shoe, which most commonly works with the Series 180 spring. You'll need the number off the old spring to confirm the best option.
Coil Housing Pivot
Coil Housing Pivot
15-087
$5.97
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