Channel balance replacement

A contractor from Pa says:
Balance says 2820 but can't compare it 100% to the choice is given on your website
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Tom from SWISCO responded:

Thanks for your photos. Based on what I see here, you have either our S351-29 or S390-29, 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.

Since your shoe is broken, you will need to measure an undamaged version.

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