Need a Andersen sash balance replacement for model 11600-3

A quick learner from Belmont ma says:
Hi I need to replace sash balancer on 12 windows. Height 74 width 32 .

I think model number is 11600-3

Please let me know what model I need to buy

Thumbnail of the uploaded file named 5AC5FC42-C39B-42D5-98B0-C84BF131B2A2.jpeg
Thumbnail of the uploaded file named BL23 10L 10-85
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Paul from SWISCO responded:

Greetings. Judging from the code numbers and size, you will need the 24-11R (for the right-hand window, looking in from the outside), and then 24-11L on the other side of the window. 

How to replace an Andersen Window Balance
How to replace an Andersen Window Balance
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