Channel part replacement

A landlord from Michigan says:
These are 1/2 inch wide, and the only number marked on them is 3010A and 2810A
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Paul from SWISCO responded:

Your balance closely resembles both our Series 351 and Series 390. The difference between these two balance lie within the depth measurement of the bottom balance shoe. For the Series 351, the depth measurement is 1" and for the Series 390 is 1-1/8". Measure your bottom shoe, like in the diagram below to determine the best match. For the one stamped with "2810" you would go with either the S351-29 or S390-29 and for the one stamped with "3010", our S390-31 or S351-31 would either work. 

Comparison of 15-001 & 15-002
Comparison of 15-001 & 15-002
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