Channel balance, and, accessories

A quick learner from Danville , Ca says:
Hello I wanna replace 8 channel balances they stamped 21 4 ep caldwell they ate 1/2 " wide can find them nowhere which ones could be use
User submitted photos of a window balance.
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Tom from SWISCO responded:
Thanks for posting! Before I can offer an applicable replacement for this channel balance, I just need to know a bit more information about the bottom attachment. Please take a look at our 15-004 and 15-005 channel balance shoes, and note their depths. As you can see, they are 1-3/32" deep and 1" deep, respectively. Which one more closely matches your own bottom attachment?

Can you also tell me if the top attachment has wings or not? I can't make it out from your picture.
A quick learner says:
15-004 is the one I need and yeah the top attachment does have wings I also send another messages asking what kind of retainer do I need for the balancer and also the stopper that stops the window on the top
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Tom from SWISCO responded:
If you have the 15-004 and, and if your top attachment has wings, I recommend that you look at our Series 385 channel balance. Does that look right?

As for your retainer and stopper, I'm afraid that I cannot identify what you need based on just your Series. I will have to see pictures of that hardware also removed from the window, and with dimensions. Thanks!
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