Which window balance do I need?

A home owner from Temecula CA 92592 says:
March 26, 2024
Current balances have a 29D USB on them. Which part number do I need?
Thumbnail of the uploaded file named winged top fitting
Thumbnail of the uploaded file named winged bottom fitting
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Emily from SWISCO responded:
March 28, 2024

Thank you for reaching out to us! Based on these photos, I recommend either the Series 380 or Series 385 channel balances. You'll have to measure the depth of the bottom shoe to see which Series is best for your repair.

If the metal channel measures 30", you may need the 2940 stamp option. A pair of balances with this stamp will support a sash weighing 23 to 28 pounds bit you can weigh your window sash on a scale to confirm. 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
30" Series 380 Channel Balance
30" Series 380 Channel Balance
S380-30
$11.30
30" Series 385 Channel Balance
30" Series 385 Channel Balance
S385-30
$11.30
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