Please help identifying window balances

A home owner from colorado says:
June 26, 2018
I have a 1/2" wide window balance I need to replace. It measures 26 1/16" from end to end on the metal frame only not including to plastic attachment pieces.

Thank you for your help!
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Thumbnail of the uploaded file named Window Balance 3.jpg
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Tom from SWISCO responded:
June 27, 2018

This is S351-26 or S390-26. I'm leaning toward S390-26, but you can measure to tell. The photo below shows the 1" shoe used on the Series 351 versus the 1-1/8" shoe used by the Series 390. Both of these balances can be purchased with the "2530" option your old balance was stamped with.

Comparison of 15-001 & 15-002
Comparison of 15-001 & 15-002
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Tom from SWISCO responded:
June 27, 2018

Yes, absolutely. Your shoe wore down over time, I believe.
A home owner from colorado says:
June 27, 2018
When measuring the shoe I am getting a measurement closer to 1 1/16", should I go with 1 1/8" series 390?
26" Series 390 Channel Balance
26" Series 390 Channel Balance
S390-26
$10.55
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