Window balance channel

A quick learner from Venice FL says:
Need 6 29" long x 1/2" x 5/8" channel, 28D USB stamped on channel. String and pulley and spring, 14 3/4" spring end to end including hook.
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Bob from SWISCO responded:

Thanks for writing in. See our S380-29 or S385-29. The only difference between these two balances is the 'depth' of the bottom nylon fitting, so compare both with your old hardware to see what matches best. You will need a stamp option of 2840. 

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