Window balance identification

A contractor from Ashland Oregon says:
November 13, 2023
Hello
I have a window balance from a viking window it measures 26 13/16" long and 1/2 wide on the back. The photos should show the plastic attachments. The numbers 2640 are stamped on and the letters B.S.I. perpendicular to the numbers.
Charles
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Jasmine from SWISCO responded:
November 14, 2023

Thanks for writing in! Your channel balance assembly appears to be the Series 395 Channel Balance with a winged top guide and non-winged bottom shoe. Since yours is stamped with a 2640 , I believe you'll need the S395-27. The length from the metal channel of this balances is 27".
27" Series 395 Channel Balance
27" Series 395 Channel Balance
S395-27
$10.23
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