Replacement of Sash Balance

A home owner from Calgary, AB says:
I'm trying to find replacement of this balance. it's 1/2" (9/16") wide with 21" long, the attached picture shows the head at the top and the end at the bottom. The end has no wings with 1" width which must be 15-002. So the right model must be S351-21 and the following one is what I need, am I right?

Thanks,

Tony
A customer submitted photo of channel balance attachments.
Profile picture of Tom
Tom from SWISCO responded:
Thank you for posting on our discussion board, and for the detailed picture! I think you're right; with a non-winged top and a non-winged, 1" bottom shoe, I think that the S351-21 Channel Balance would be your best bet. As for the stamp option, go with 2040.
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