1640 dk caldwell channel balance

A home owner from seattle says:
July 22, 2019
I need to replace this channel balance. When I search for this on you site I get numerous ones that all look the same to me, but have different id numbers. This is a 17 inch channel balance for a non-tilt window.

Please let me know which one I need.
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Paul from SWISCO responded:
July 29, 2019

Let's have you start with taking a close loo at our S385-17 channel balance. Measure the depth of your bottom balance fitting and see if it compatible with ours. If so, then you can go with the 1640 option.
17" Series 385 Channel Balance
17" Series 385 Channel Balance
S385-17
$9.34
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