Rivco channel balance parts/installation advice needed

A quick learner from Southern NH says:
I have Rivco tilt windows from the late 70s.
I need to replace something that looks like a 24
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
I see you were looking at our Series 751 channel balance. This looks like it's a good match. How well does the information shown on the S751-24 store page match up to your o wn? It looks like yours may also install with a hook like our 19-029 or 19-030.
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