double coil balance

A professional from Goldsboro, NC says:
Need to replace double coil balances in customer's windows that have no identifying marks or window manufacturer.
white case is 3"
white case w/ black block 3 1/2"
twist lock receiver 1"
channel depth is 9/16"
channel width is 1 1/4"
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Hello again! Check out our 15-111 pivot shoe and I believe the Series 160 1/2" wide coil spring. You will need the stamped weight number printed on the spring in order to identify the proper match. Let me know what you think!
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