windows cant stay up

A handy person from St Louis says:
I am renovating a home and the windows do not stay up. Can you tell by the pictures what sash balance I need to replace these?
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting! This hardware looks like our Series 303 spiral balance. What do you think? You may want to double check your support hardware to know for sure. If you have our 18-002 top sash guide and our 17-018 & 17-019 clips, there is a good chance that you have the Series 303.
A handy person from St Louis says:
Thank you for your help. I was able to find all the parts I needed on the site.
How to replace the Keller Series 303 Window Balances
How to replace the Keller Series 303 Window Balances
GUIDE
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