Gapco Channel Balance ID

A quick learner from Tennessee says:
Im needing 4 sets of these springs for my windows. There are 8 windows in my sun porch and only 4 can be opened til I get these teplaced.
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Bob from SWISCO responded:

This looks like either an S380-18 or S385-18. 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 1740. 

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