Duraseal channel balnace BSI 28C

A quick learner says:
I am trying to find this window part. I believe it a Duraseal Window. The letters on the part are " BSI 28C". Photos attached.
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Casey from SWISCO responded:

Hello,

Take a look and compare the S795-28 channel balance with a 28C strength option to your assembly. Keep in mind that these use a screw tab at the end of the pulley cord for installation. Thank you!

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