Ordering new channel balance kits

A home owner from Reno,NV says:
old aluminum windows 34*31

Channel balance see pic 1/2 I assume metal is what is measured for the length 29 ?

Number inside on metal pic 3 S8 3 11 ?

Please advise on which Channel balance ( complete set ) I have to order from you

Cant upload pictures ..??
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Tom from SWISCO responded:

Thanks for contacting us! I'm afraid I cannot determine what you need based on this information. I see you were looking at our S385-28. Is this similar to what you have? The best way to confirm is to carefully go over the design and measurements of the top and bottom nylon attachments (19-005 and 15-004). As long as those match up, you should be okay. If they differ, though, we will need photos. Let me know and we can work from there.

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