Window Balance: 30 3 FR CALDWELL

A quick learner from 92620 says:
The flexible cord and clip that holds the cord to the side of the window have broken and have been discarded. So I believe the simplest solution is a replacement balance for that side of my window.

Could you let me know which part number I'll need to purchase? Thanks.
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A quick learner from 92620 says:
I forgot to add the length of the Window Channel Balance. It is 31 inches. Sorry.
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Emily from SWISCO responded:

Hi there!

With this combination of attachments, you could have either an S380-31 or S385-31 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 a spring strength option of 3030.

If you have any further questions just let us know. 

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