Need two window balances

A home owner from CA says:
31 5 JW CMC 11
Thumbnail of the uploaded file named image.jpg
A home owner from CA says:
I will add photos of the top and bottom. Thank you.
Thumbnail of the uploaded file named image.jpg
Thumbnail of the uploaded file named image.jpg
Thumbnail of the uploaded file named image.jpg
Thumbnail of the uploaded file named image.jpg
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Bob from SWISCO responded:

It appears you have either an S380-32 or S385-32. The only difference between these two channel balances is the depth of the bottom nylon shoe, as shown in the picture below. Compare both with your old hardware to see what matches best. For a new stamp option choose 3150. 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
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