Need advice for spring part

A quick learner from Indiana says:
I have 10 windows I would like ro replace this part. Do all windows of different sizes but same manufacturer all take the same. Would like to replace these before cold weather is here. Thanks.
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Tom from SWISCO responded:

Your pivot shoe looks like a match for our 15-111, which is designed to be used with the Series 160 coil spring. Look these two parts over and see what you think.

If your windows are all made by the same manufacturer, then there's a good chance they're the same type, but the number and strength of the springs will definitely be different. You will need to check every window, one by one, to be sure.

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