Window balance

A quick learner from Zion, IL says:
I need to purchase 2 balances for my window that will no longer stay in the up position. I've attached pictures for your viewing. There are 2 coils in each balance. I tried to zoom in on the writing on the coil as well. The white plastic part is 1 1/4 inches but 3.5 inches.

Thanks in advance for your time and consideration to this mater.
User submitted photos of a coil window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thank you for posting. This cover looks like our 15-204. If you agree, I also recommend our Series 165 coil spring. If you also find you need to replace the pivot shoe, you can upload a few pictures of that, as well. Thanks!
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