S390-24 Question Sash hardware

A home owner from USA says:
I went through your identification process and looks like I need:
24" Series 390 Channel Balance
option: 2320
However when I measure the length of the balance it is exactly 23.5" I am not sure which to order.

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Paul from SWISCO responded:
Can you confirm you're only measuring the metal channel? Do not include the nylon attachments in your measurement. If you want, you can show us a few pictures of the balance (both ends) and we can make a recommendation.
A quick learner from Ohio says:
See attached photos
User submitted photos of a window balance.
A quick learner says:
See new pictures attached with channel laying in window edge. It sticks out from the end 1/2 inch when it is pushed in all the way to the top stop. When I try and match the bottom of the metal part of the channel to the bottom of the window, the channel has to slide up and forward and pushes out of the channel.
User submitted photos of a window balance.
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Paul from SWISCO responded:
Thank you! I just wanted to confirm, since this balance will have to be custom made. Check out this Custom Channel Balance Request Form I've started for you based on your specifications and fill out the blank fields. One of our representatives will get back to you with a price quote and an item to add to your cart.
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