25" block and tackle window balance

A handy person from Spring Hill, Florida says:
November 18, 2016
One side of the part has 2410F inscribed on it.

I need to order a set of these.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
November 21, 2016
Please stake a look at our S351-25 channel balance, this may be what you need. This comes with a 19-002 top and 15-002 bottom pre-attached, so it's important to make sure these match up with what you have on your balance now.
25" Series 351 Channel Balance
25" Series 351 Channel Balance
S351-25
$10.77
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