1960's plastic double hung compression rails w/ spring lift assist- where to get replacements?

A home owner from Indiana says:
Hi-I have these wood windows and some of those plastic side channel rails are needing replaced. The left ones compress into the frame pockets via a spring metal strip. Right channels are just screwed to frames. Sashes are removed just by shoving them left then popping out. Any thoughts? Will be needing some lift springs and mechanisms too. Thanks- Mark
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Jasmine from SWISCO responded:

Thanks for reaching out! We can supply you with the clutches for this balance assembly but unfortunately, we cannot supply the balance spring. Take a look at our 20-006 Four Piece Crestline Clutch Set. 

I do apologize that we cannot assist with the complete repair but please feel free to reach out with any other hardware repair projects you might have.

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