Replacement balancer for non-tilt window

A quick learner from Berkeley says:
Hello,
I am trying to figure out the replacement for this balancer. The length of metal part is 21". Which balancer should I choose?

Thank you,
M
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Casey from SWISCO responded:

Hello,

We'd be happy to help you find the correct balance, but I can't tell if your top nylon attachment has wings that jut out to the sides or not. If you could confirm this or send another picture of your top attachment from a different angle, we should be able to make a recommendation. thank you! 

A quick learner from California says:
Hello,
Thank you for your response. Yes, both ends have wings that jut out.

Thumbnail of the uploaded file named bottom.jpg
Thumbnail of the uploaded file named top.jpg
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Casey from SWISCO responded:

Hi, thanks for the additional photos! Because of the wings on your plastic attachments, you either have a Series 380 or Series 385 balance. To determine between the two, just measure the depth of the bottom attachment. If it measures 1", you'll need an S380-21 but if it measures 1-3/32" you'll choose an S385-21 balance. Hope this helps!

Comparison of 15-004 and 15-005
Comparison of 15-004 and 15-005
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