33B BSI Channel Balance replacement

A home owner from Alabama says:
February 28, 2022
Looking to replace a tilt window balance, approximately 20 yrs old. It screws in at the top with a Phillips head., has a coil and a string attachment at the other end. It is stamped 33B BSI. The window info is attached as well. Can you help?
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Casey from SWISCO responded:
March 2, 2022

Hello,

I would recommend starting by comparing your balance to the S770-33 with a 33B strength option. Thanks for posting! 
33" Series 770 Balance
33" Series 770 Balance
S770-33
$13.67
How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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