vinyl window balance, no strings or spiral

A contractor from 08108 says:
November 10, 2020

please ID, and tell me how to replace

Thanks

pete 

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Bob from SWISCO responded:
November 12, 2020

Hey Pete. This looks like a Coil balance system. Specifically, this appears to be our 15-087 and 15-086 Housing Components, which use the Series 180 Coil Springs. Let me know if you have further questions. 
Tandem Coil Housing
Tandem Coil Housing
15-086
$1.68
Coil Housing Pivot
Coil Housing Pivot
15-087
$5.97
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