Identify Part In Photo for Purchase.

A contractor from Wilmington, DE says:
The coil balancer in the photo had a 15 stamped on the plastic. It is 1-1/4" wide and measures about 1/2" deep. This is from the upper sash of a double-hung window. Both sashes tilt in. In the photo the shoe is broken. I will want to order 8 so the balancers can be replaced in 4 sashes.
In the installed photo, part of the shoe is missing.
Thumbnail of the uploaded file named 100_5046.JPG
Thumbnail of the uploaded file named IMG_20231209_104443248.jpg
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Casey from SWISCO responded:

Hello,

Your coil balance resembles the S140-15 shown below. This assembly will support a sash between 29-30.99 lbs. Take a look and let us know if you have any other questions. Thanks for posting! 

Alternate image for S140-15
Alternate image for S140-15

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