28B BSI LH. Window spring

A handy person from Tennessee says:
September 23, 2021
I'm needing 2 window springs with the same end connection and the stamp on the spring says 28B BSI LH. But I don't know the part number
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Emily from SWISCO responded:
September 28, 2021

Hello there!

This looks like our S775-28 with a stamp option of 28B. You'll just need to measure the size of the shoe to determine if you need a 1" shoe or 1-1/4" shoe. If you have any questions just let us know! 
28" Series 775 Balance
28" Series 775 Balance
S775-28
$21.91
How to install a S775 balance
How to install a S775 balance
GUIDE
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