Replacement - which one is correct?

A quick learner from Winter Haven, FL says:
July 12, 2017
I need to replace broken Block and Tackle Window Balances. Do not know who is the window manufacturer. It is a non-tilt window and side load. Measurement is 15" and a 9/16" channel.

The window has a label w Mfg Code YOM-1 Series 9500. Window H-R50 53x74

The marking on the broken one is 14DS (BSI) GL and a 23. Please advise ASAP. Thank you
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Tom from SWISCO responded:
July 14, 2017
Thanks for all the information! Unfortunately, we can't identify the Series of balance you need unless we see photos of both ends of the balance. If you respond with photos, I can try to identify it for you.
A quick learner says:
July 14, 2017
Pictures of the one that is not broken
User submitted photos of a window balance.
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Paul from SWISCO responded:
July 17, 2017
Thank you! I think you could have either our Series 390 or Series 351 channel balance, depending on the depth of the bottom shoe. That is the only difference between them.
A quick learner says:
July 17, 2017
How do I measure to correctly determine the depth of the shoe? I'm a very visual person, so
Maybe you can send me a pic or illustration? Thank you
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Tom from SWISCO responded:
July 20, 2017
You would measure the depth, which is the heel-to-toe measurement. We have detailed pictures and dimensions on our site. I will also post them here for you to consider.
Comparison of 15-001 & 15-002
Comparison of 15-001 & 15-002
15" Series 351 Channel Balance
15" Series 351 Channel Balance
S351-15
$9.34
Channel Balance Shoe, 1-1/8" Depth
Channel Balance Shoe, 1-1/8" Depth
15-001
$0.74
Channel Balance Shoe, 1" Depth
Channel Balance Shoe, 1" Depth
15-002
$0.74
How to Replace a Non-Tilt Channel Balance
How to Replace a Non-Tilt Channel Balance
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How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
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How to Replace a Channel Balance Attachment
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How to replace a non-tilt channel balance
How to replace a non-tilt channel balance
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Choosing a Non-tilt Channel Balance: What Will We Need?
Choosing a Non-tilt Channel Balance: What Will We Need?
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Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
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