Window sash balance

A home owner from Florida says:
June 16, 2020
I have sash balances non tilting that are in the same size windows but some are labeled 28B USB and others are 28D USB I need to know which complete sash balancer I need to order
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Bob from SWISCO responded:
June 19, 2020

This looks like an S389-29 balance, with a stamp option of 2840. However, check the bottom nylon shoe's depth, or 'heel-to-toe' measurement. The Series 380 uses our 15-005 1" deep shoe; but if yours is 7/8" instead, you'll need balances custom built with the 15-029 7/8" deep shoe. We'd be happy to do this, but just let us know. 
29" Series 380 Channel Balance
29" Series 380 Channel Balance
S380-29
$11.10
Winged Channel Balance Shoe, 1" Depth
Winged Channel Balance Shoe, 1" Depth
15-005
$0.74
Winged Channel Balance Shoe, 7/8" Depth
Winged Channel Balance Shoe, 7/8" Depth
15-029
$0.82
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