Single hung sash windows

A quick learner from California says:
June 16, 2021
I'm a little confused. I measured the metal only and it was 27", however the stamp on the slider says 26 4 KW CMC. I don't see any other numbers. Please let me know any information you can so I can replace both sliders on my window.
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Tom from SWISCO responded:
June 21, 2021

Thanks for your photos. Based on what I see here, you have either our S380-27 or S385-27, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
A quick learner from California says:
June 21, 2021
Thank you for the response. I measured the shoe at 1 3/32". So it looks like the S385 27 is what I need.
27" Series 380 Channel Balance
27" Series 380 Channel Balance
S380-27
$10.55
27" Series 385 Channel Balance
27" Series 385 Channel Balance
S385-27
$10.55
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