36402 channel balance 37"

A quick learner from Kansas City mo says:
What is the appropriate replacement part for 36402 balance 37"
And
2020(v) balance at 21"
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Tom from SWISCO responded:

Hello! This looks like a pretty standard balance. I believe you have either our S390-37 or S351-37, depending on the depth of the bottom shoe. Look over our measurements and information on each product's respective store page and let me know which one matches up best.

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