Window Balance Stamping

A home owner from St Francis says:
September 6, 2017
Good Afternoon,
I'm looking at replacing all 4 balances on a double hung "tilting" window but I can't match the stamping to anything on your website. I removed the interior pane of the double hung and it looks like one balance reads "22 BSI" and the other just "22"

Please see the attached photos for clarification and thank you in advance for your help!

Jim
Channel balance
Profile picture of Tom
Tom from SWISCO responded:
September 11, 2017
Hi, Jim. Could you remove the balance from the window and send us photos of both ends? The middle of the balance actually doesn't matter very much; only the end pieces.
23" Series 751 Channel Balance
23" Series 751 Channel Balance
S751-23
$10.98
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