Fwd: window channel balancing

A quick learner says:
Hi, I am not sure i even need a part(s) but I want to order in case i need them and can't find them anywhere. The item i have says 2820 and is 29 inches long. the top guide is 19-002, pics attached.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Have you seen our Series 390 channel balance yet? This looks like it could match what you have. This comes with the 19-002 top and 15-001 bottom fittings pre-attached. I would also recommend the 2820 stamp option, of course.
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