1840 B.S.I. Window Channel Balance

A home owner from San Francisco says:
November 6, 2017
I need to replace the channel balances of several (not sure exactly how many at the moment) windows. The only inscription on the part is 1840. They are 19" long. I see you have several that look appropriate. What is the difference between the "series" numbers?

Thanks for your help.

Mary
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
November 10, 2017
Hello Mary. Our S390-19 channel balance with a 1840 option should be able to be used as a replacement. Take a look and let us know if you agree.
19" Series 390 Channel Balance
19" Series 390 Channel Balance
S390-19
$9.34
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