Need replacement sash balances 21 3 AL Caldwell

A quick learner from California 94518 says:
Need to replace both sash balances left & right.
Rail is 22", overall length 23", width is 9/16.
Stamped on metal 21 3 AL Caldwell
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Emily from SWISCO responded:

Hi there!

I recommend our S380-22 or S385-22 channel balances. The difference between the two Series is the depth of the bottom shoe as shown below. You'll have to measure yours to determine the best match. I also recommend the 2130 option for your replacements. 

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

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