Help finding replacement

A quick learner from California says:
September 24, 2023
I have these old windows and the cord is frayed and about to snap on one. I need the replacement. I'm hoping you can help. And any tips on installing the new one ?
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A quick learner from California says:
September 25, 2023
I submitted a "part finder" post reference number
D303581. I forgot to include this number that I found on the back of the channel. It say "S 153"
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Lauren from SWISCO responded:
September 26, 2023

Hello, thank you for posting,

Unfortunately your original balance has been discontinued and we can no longer offer a suitable replacement. The only part we can provide the 15-209 end bracket. I apologize that we cannot assist with your repair. 
Balance End Bracket
Balance End Bracket
15-209
$9.70
Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
GUIDE
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