identify the part for balance shoe

A home owner from saint louis, mo says:
I am attaching some pictures of a broken part and a working part on my window. Can you please tell me which replacement part works for me?
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Based on your 15-180 shoe and 15-181 coil support, I can tell that you need Series 190 coil springs. Check the end of the coil, where it touches the shoe, for a stamped number that tells you which coil in the Series you're going to need.
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