Window Channels

A home owner from Davie, Florida 33331 says:
Channel is 1/2" wide and 26" in length. It are easily 27 years old. I'm not 100% sure but I think the plastic parts are 19-002 and 15-002 but I'd like confirmation before ordering a bunch of these to replace in my house.
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Casey from SWISCO responded:

Hello,

If your bottom fitting has the same 1" depth as the 15-002, then you would need the S351-26 channel balance for your repair. It's hard to make out but it looks like the balance in your photo may be stamped with 25B. If so, you will need 2520 strength options for your replacement balances. Take a look and thanks for posting!

Detail of 15-002
Detail of 15-002

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