Kinro window sash ballance

A quick learner from Colorado says:
I am trying to track down replacement parts for this sash balance. It it 27" long. Please see photo for only p/n's I could find on it.
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Lauren from SWISCO responded:

Hello, thank you for posting! 

With this combination of attachments, you could have either an 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. 

Swisco.com
The length needed will be 27" with a 2630 stamp option. Please let me know if you have any questions. 
S380-27 : 27
27" Series 380 Channel Balance
S380-27
$9.84
VIEW >
S385-27 : 27
27" Series 385 Channel Balance
S385-27
$9.84
VIEW >
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