channel balance 28" 273 BSI

A home owner says:
November 6, 2011
Hi. Looking to replace channel balances. 28" and have a 273 and BSI stamped at one end.
A customer submitted photo of window balance attachments.
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Paul from SWISCO responded:
November 9, 2011
Please look at our S390-28 Channel Balance with the 2730 stamp option.
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