Unsure which coil balance parts to buy

A quick learner from Troy says:
Hello! I need to replace two of these--one on each side for the upper sash. The window has no brand or number that I can locate. Any help identifying the right replacement would be appreciated. Thanks in advance!
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Thumbnail of the uploaded file named IMG_4441.JPG
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Casey from SWISCO responded:

Hello,

Your pivot shoe resembles our 15-180, which is designed to work with the Series 190 coil springs. Your original coils should have stamp codes on them that you'll use to choose the corresponding strength option. 

Review the specifications shown on our product pages to confirm they match up to yours. We've also related a few videos on this page to help you through the process. Thanks for posting! 

How to Replace a Triple Coil Balance System
How to Replace a Triple Coil Balance System
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How to remove window pivot shoes
How to remove window pivot shoes
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Anatomy of a tilt window
Anatomy of a tilt window
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