Jordan window balance

A from Brandon, MS says:
January 18, 2021
Hello, I am looking for this window balance. I need 18 of them. These windows are no-tilt. The depth is 5/8". The width is 9/16". The length is 34". This house was built in 2006. Thank you in advance!
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Bob from SWISCO responded:
January 20, 2021

This appears to be either an S390-34 or S351-34 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, or 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. For a new stamp option choose 3330. 
A from Brandon, MS says:
January 20, 2021
Thank you for your response. You said it depends on the depth of "the bottom nylon shoe". Is that the "Channel balance shoe"? On both of these models the channel balance shoes are the same size. I am obviously looking at the wrong part.
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Bob from SWISCO responded:
January 20, 2021

See the image below. It shows the difference I'm talking about between the Series 351 and Series 390.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
34" Series 390 Channel Balance
34" Series 390 Channel Balance
S390-34
$11.73
34" Series 351 Channel Balance
34" Series 351 Channel Balance
S351-34
$11.73
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