Window balance

A quick learner from Desert Hot Springs California says:
28 in Long marking on part part 2740
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Bob from SWISCO responded:

Thanks for writing in. See either our S351-28 or S390-28. The only difference between these two channel balances is the depth of the bottom nylon shoe, or the measurement from heel-to-toe. See the picture below for reference. Compare both balances with your old hardware to see what matches best. For a new stamp option, choose 2740.

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

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