Window balance stamp 21D

A contractor from Petaluma says:
March 20, 2018
Hello I have a window balance with the stamping of 21d and I need some replacements for that. Do you have anything that's compatible?
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
March 23, 2018

Thanks for contacting us. We see that you have a channel balance that measures 22" in length and has the 19-002 channel balance top shoe attached to it. You would need to identify the bottom fitting of your balance in order to choose the correct Series. I encourage you to go through our media guides on how to pick the appropriate Series. Whichever balance you decide on, the option you would go with is our 2140 based on your "21D" stamping.
Channel Balance Top Guide
Channel Balance Top Guide
19-002
$0.74
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How to Replace a Top Sash Guide [1080p]
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How to identify a replacement channel balance
How to identify a replacement channel balance
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How to replace a window sash channel balance
How to replace a window sash channel balance
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How to Replace a Channel Balance Attachment
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Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
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