Need channel balance replacements

A home owner from Highlands Ranch, Colorado says:
27 inch with 2630 stamp
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Jasmine from SWISCO responded:

Thanks for writing in! It looks like you have either the S351-27 with a 1" shoe or the S390-27 with a 1-1/8" shoe. To determine which series is needed for your window, look over the dimensions from the diagram below to confirm the depth of your bottom shoe. You'll need to select the 2630 stamp.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

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