Channel balance

A home owner from USA says:
Not sure why I can submit pictures through the identify a part. So I thought I would try an email. Thank for your help.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
It looks to me like you need our S380-29 side-load balance. Measure your shoe as shown below. If it matches, you need Series 380. The spring weight option for "28 B 20" is usually "2820." To verify, weigh your window sash, which should come out between 12 and 16 pounds.
Alternate view of 15-005
Alternate view of 15-005
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