Channel balances

A quick learner from San Jose ca says:
Hello I need a new set of 16 inch channel balances for a double pane single hung aluminum bathroom window. Please help me find them and send me the cost so I can order thank you
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Tom from SWISCO responded:

Thanks for your photos. Based on what I see here, you have either our S351-16 or S390-16, 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 S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

A quick learner from San Jose ca says:
I may be splitting hairs here but it depends on exactly where you measure to. Take a look at these photos and please advise thank you.
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Tom from SWISCO responded:

It's difficult to tell from just a photo of a tape measure. It looks to be 1", but I could also be misinterpreting the angle of the picture.

As for where to measure, it's just the full depth of the shoe, not partial. You need to measure the whole thing.

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