help with Unique 25-d-40 channel balance

A home owner from USA says:
July 9, 2015
Hello,
I am writing to see what it would take to get 4 replacement channel balances to replace the Unique 25-D-40 ones I have which look like they were made June of 2003(?). I am including pictures and based on what I can see the Series 380 with the 15-005 bottom shoe is the replacement one. But not sure. The length of the channel measures 26". The length of the bottom shoe is 1" and not 1 3/32". I see the series only comes with one top shoe but no dimensions so I can only assume it will work. Does the 25-D-40 also represent the sash weight which would be 19-25 lbs? Can someone help?

Thank you,
Brian
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
July 13, 2015
Hello, Brian. I believe our Series 380 is a possible match for you, yes. Based on your stamp of 25-D, I would recommend our 2640 option, but you can always weigh your sash just to confirm.
26" Series 380 Channel Balance
26" Series 380 Channel Balance
S380-26
$10.55
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