kitchen window sash balance

A home owner from Oakland, CA says:
It says 26-3 KX CMC 7
Looking for a replacement. Thank you!
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Bob from SWISCO responded:

Can you show me the nylon fitting on the other end of this balance? From there I'll do my best to help. 

A home owner from Oakland, CA says:
More photos.
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Bob from SWISCO responded:

Perfect, thanks. This looks like either an S351-27 or S390-27, depending on the depth of the bottom nylon shoe. For a stamp option, use 2630. 

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