Window Balance replacement (Window will not stay open)

A landlord from Ashburn, VA says:
I believe I need new Window coil and shoe. I have included a picture. Window does not stay open. Can you help identify the right pieces. There is a 7 on the coil itself.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Take a look at our 15-180 pivot shoe, in addition to our S190-740 coil spring.
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