Channel Balance Assistance

A from MIddleburg, FL says:
Need 2 (left and right) of this part - measures 30" from outermost point on plastic pieces end to end. There is a number stamped on it: 2820B (the B is backwards when reading the number correctly).

Last repair needed before closing on a home.

Thank you
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Bob from SWISCO responded:

Take a look at our S351-29 and S390-29. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need a stamp option of 2820. 

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