Sash balance sash 14 2 B.S.I.

A quick learner from Indio CA says:
Photo shows the part and plastic ends. Roughly 15" channel.
Thumbnail of the uploaded file named sash balances 14 2 bsi.jpg
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Casey from SWISCO responded:

Hello,

We can supply your replacement balances but it will need to be a custom order due to the length, extended travel pulley system and unique combination of end attachments. To get started, we'll need to see the number of replacements that you need, with the minimum being two. Thank you. 

A quick learner from Indio CA says:
what about

S385-15 - 15" Series 385 Channel Balance
Option: 1420
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Casey from SWISCO responded:

Unfortunately, the S385 and our other stock balances do not use the same extended travel pulley system, which will not have the travel needed for your window to function properly.  

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