Searching for 31 3 BQ Caldwell

A quick learner says:
September 18, 2020
Looking for 32 inch sash balance replacements for my Mercer windows. Number on balance is 31 BQ Caldwell - see photo. Window is 15-20 pounds
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Bob from SWISCO responded:
September 23, 2020

See our S380-32 or S385-32, depending on the bottom nylon shoe depth. In either case you will need a stamp option of 3130. 
32" Series 380 Channel Balance
32" Series 380 Channel Balance
S380-32
$11.52
32" Series 385 Channel Balance
32" Series 385 Channel Balance
S385-32
$11.52
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