Unknow balance

A quick learner from Bloomington, IL says:
I need to find these window balances -- I am interested in four pairs. Maybe more, I will check on the other windows. This was for a system known as
User submitted image of their window hardware.
Profile picture of Paul
Paul from SWISCO responded:
It's tough to say based on this picture, but you might have our Series 751 channel balance assembly. Carefully look it over and tell me what you think.
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