33B BSI Channel Balance replacement

Home Owner from Alabama
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
Casey from SWISCO
SWISCO
Expert

Hello,

I would recommend starting by comparing your balance to the S770-33 with a 33B strength option. Thanks for posting! 

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