Looking for a part

A home owner from Salt Lake City says:
The S140 looks close to me, but I haven't gone looking through them all. Also, do I choose the weight based on how much the window weighs out of it? And that first picture has it rigged up, feel free to ignore the o-ring screw.
User submitted photos of a coil balance.
Profile picture of Paul
Paul from SWISCO responded:
I'm not sure if our Series 140 will work, as the shoe is a little different. Yours appears similar to our 15-177, but compare the dimensions to make sure. This shoe works with our Series 152 coil spring. You can match the number on your existing spring to determine which Series 152 can work.
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