Replacement window balancers for EPI windows

A quick learner from Brooks, OR says:
Need replacement balancers for 9 single hung windows:
Stamp 1920 - balancer metal measures 20"; including plastic ends 21" = 4 balancers
Stamp 2520 - balancer metal measures 26"; including plastic ends 27" = 14 balancers

Please help me with which balancers to order.
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Casey from SWISCO responded:

Hello,

We'd be happy to help but, unfortunately, we have no record of the balances EPI used for their windows. We should be able to supply the replacement parts that you need but we'll need to see clear photos of the top and bottom fittings and pulley clip of your balance fully removed from the window to compare to our inventory. Thank you! 

A quick learner from Brooks, OR says:
I will disassemble the window and send you pictures as soon as possible.
A quick learner from Brooks, OR says:

Additional information provided:

Need replacement balancers for 9 single hung windows:

Stamp 1920 - balancer metal measures 20"; including plastic ends 21" = 4 balancers

Stamp 2520 - balancer metal measures 26"; including plastic ends 27" = 14 balancers

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A quick learner from Brooks, OR says:

Additional pictures 

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Casey from SWISCO responded:

With this combination of attachments, you could have either the S380 or S385 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. 

You'll also need 1920 spring strength options for your 20" and 2520 for the 26" replacement balances. Thank you and let us know if you have any other questions or concerns.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.

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