need new parts

A quick learner says:
November 8, 2023
one says 2420 and the other from the same window says 2410 whoever replaced the window messed up all the windows in my home all say 2420 and i believe are all 25" long.
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Lauren from SWISCO responded:
November 9, 2023

Hello, thank you for posting,

It appears you have either our Series 351, with a 15-002 bottom attachment, or Series 390, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need.

The stamp should be the same on both balances per window sash. To move forward, please provide the weight of the window sash. Thank you! 

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
25" Series 351 Channel Balance
25" Series 351 Channel Balance
S351-25
$10.77
25" Series 390 Channel Balance
25" Series 390 Channel Balance
S390-25
$10.55
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