Anderson Window Balance Identification Part Number

A handy person from Rhode Island, USA says:
May 25, 2019
Hi,

I need to purchase two balancers for my window but can't identify/locate the part number.

The only part number on the actual balance, if it is indeed the part number, is:
P89 1227 1-88

The dimensions are:
Height: 5/8"
Width: 3"
Length: 6 5/16" + the lip

What do you charge for two and how soon can they be delivered?
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Bob from SWISCO responded:
May 28, 2019

Thanks for posting. The most reliable way to determine the Andersen balance you need is to go by the codes on the balance box. An old balance box with the stamp code '1227' can be replaced by our 24-1231. Yes, this works for both hands of the window. 
Andersen Sash Balance, 1226, 1227, 1231
Andersen Sash Balance, 1226, 1227, 1231
24-1231
$54.20
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