Looking for this part

A contractor from Colorado Springs co says:
Trying to help an elderly lady ( I'm not a window guy). Don't know window brand or installer. Many of these are broken and need replaced. Any help identifying a part number of original or good substitution would be greatly appreciated.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
The pivot shoe looks like our 15-155, which is meant to use our Series 170 coil spring. Check this hardware out and see what you think.
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