Window coil system

A handy person from Cincinnati says:
It's the shoe and the upper coil. The upper piece says parent number 6,978,169 and is 1.25 inches wide. I don't see any markings on the shoe, unfortunately.
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Casey from SWISCO responded:

Hello,

This looks like a match for our S140-11 coil balance system but make sure to review the dimensions to confirm. Thanks for posting!

A handy person from Cincinnati says:
Thank you! I think that's it. Do I just need to order 2? I can't imagine I need anything else, but want to make sure.
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Casey from SWISCO responded:

If the balance is all that's broken, then that will be all you need to replace. We do recommend replacing the balances on both sides of the window since if one is broken, the other is most likely close behind. 

A handy person from Cincinnati says:
Thanks! I just bought 2.
How to Replace a Triple Coil Balance System
How to Replace a Triple Coil Balance System
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