1640 dk caldwell channel balance

A home owner from seattle says:
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:

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.

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