Need to order 2 of these.

Handy Person from Miami, FL
They are stamped 2975.  They are 30 inches long. They have a metal spring, pulley, and string in the channel 
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Bob
Bob from SWISCO
SWISCO
Expert

Thanks for posting. This looks like either an S351-30 or S390-30. The only difference between these two channel balances is the 'depth' of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below for reference. Compare both balances with your old hardware to see what matches best. For a stamp option choose 2975.

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

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