Window master 620 SH channel balance

A quick learner from California says:
Hi, I'm looking for a new balance for a Windowmaster 620 SH (H-LC25-1219x2438 [48x96]). The balance is 24" long (not including the plastic) and has a 2390 BSI 27 DV stamped on it. Any help would be appreciated! Thank you.
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Emily from SWISCO responded:

Hello,

With this combination of attachments, you could have either the S380-24 or S385-24 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need to weigh your sash to determine which strength option you'll need since the 2390 stamp on your balance is from an outdated weight system. There is a chart on the product page that explains how to choose your option based on the sash weight. 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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