Andersen window sash balances

A home owner from Portland, Maine says:
August 19, 2022
I have four very large windows with sash balance numbers:
P24 12SL 381
P23 12SR 481

The P24 came out easier than the P23, so maybe 1 had bee replaced?
Can you provide replacement units?
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Tom from SWISCO responded:
August 23, 2022

Hello! Thanks for contacting us. Based on your old stamps of "12SL" and "12SR," my respective recommendations would be our 24-13L and 24-13R Andersen brand sash balances.

Please let me know if you had any questions! We're always here to help.
Andersen Sash Balance, 13L, 12SL
Andersen Sash Balance, 13L, 12SL
24-13L
$54.20
Andersen Sash Balance, 13R, 12SR
Andersen Sash Balance, 13R, 12SR
24-13R
$54.20
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