Window Spring Balance - 26 4 CQ CALDWELL

A home owner from Indianapolis Indiana says:
Replace total window spring balance assembly. Window Spring Balance - 26 4 CQ CALDWELL. Channel: 27 inches long & 1/2 wide & end pieces have wings.
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Bob from SWISCO responded:

This looks like either our S380-27 or S385-27  channel balances. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. For a stamp option choose 2640. 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
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