Need new coil balance assemblies and pivot bars for Simmonton tilt window with no markings.

A quick learner from Ca says:
Need to find replacement parts for coil balance and pivot bars for simmonton tilt window. Please see attached photos. There ar no marking on any of the parts or the window.
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Thumbnail of the uploaded file named image.jpg
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Tom from SWISCO responded:

Hello! Your shoe appears to match our 15-111 , which is designed to be used with a Series 160 coil spring. We also sell the 26-241 pivot bar. 

Look these parts over and let me know if you had any questions.

A quick learner from Ca says:
So which lb coil spring should I use with this particular window setup?
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Tom from SWISCO responded:

There should be a stamp printed on your old spring that you can use as a reference to pick the best option. If no such stamp exists, or if it's too faded to read, then you will have to weigh your sash on a scale and divide that by the number of springs supporting it.

For example, if your sash is 22 pounds and you have 4 springs on each side, you'd want the 5.5 pound option.

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