Window coil balance need to identify replacement

A quick learner from New Jersey says:
April 7, 2024
Hi. Looking to replace entire window coil balance and lock shoe
Coil letter F
Thumbnail of the uploaded file named image.jpg
Thumbnail of the uploaded file named image.jpg
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Bob from SWISCO responded:
April 7, 2024

Hello there. This looks like a 15-177 Pivot Shoe, which uses Series 152 Coil Balances. A Series 152 coil spring stamped 'F' can be replaced with the S152-6 6 pound spring. If your old coil housing is undamaged you can reuse it; otherwise, see the newer style 15-143, 15-144, and 15-145. These components 'sandwich' around the coil spring. Let me know if you have further questions. 
Coil Balance Shoe, Slate Blue
Coil Balance Shoe, Slate Blue
15-177
$3.47
6 lb Series 152 Coil Balance
6 lb Series 152 Coil Balance
S152-6
$4.80
Coil Bushing
Coil Bushing
15-143
$0.97
Coil Bushing Cap
Coil Bushing Cap
15-144
$0.70
Coil Support Barrel
Coil Support Barrel
15-145
$0.49
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