Coil balances

A quick learner from Lascassas Tennesse says:
Looking for replacement balance spring system for 2 windows one 50" tall and the other 71". Please see pictures attached of the 2 parts I'm looking for.
Thumbnail of the uploaded file named YKK Window pic1.jpg
Thumbnail of the uploaded file named YKK Window pic2.jpg
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Bob from SWISCO responded:

This looks like it might be an older version of our S140-11 Coil Balance system. Please remove and compare the dimensions to confirm. This system holds 11 pounds of support on its own, and with one on either side of the window that would equal 22 pounds of support. Let me know if that seems right, or if you have any further questions. 

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