Need Andersen balances 11600-17

A quick learner from Buffalo, NY says:
I'm looking for the right sash balance pair for my window. Andersen, double-hung, glass is 32-1/2"x20" high.

They are Andersen Corp. 11600-17 is stamped on one side along with (somewhat unclear) 061 7/27 5-86

Profile picture of Donna
Donna from SWISCO responded:
I am not sure, it is not very clear from the numbers you gave us.

Are there any numbers on the side of the box?
A quick learner from Buffalo, NY says:
The box is 3/4" thick, 2-7/8" wide, 6-3/4" long including the 1/2" tab on one end. It looks just like the pics on your web site... so I suspect it's just a matter of getting the right spring strength (each sash weighs 15 lbs).

More numbers found... 3335-455. Our house was built in 1987... Andersen Corp, Bayport, Minn also on the balance ... (hopefully something useful in all of this)

Thanks again!
Profile picture of Paul
Paul from SWISCO responded:
Please take a look at the Swisco 24-737 Andersen Sash Balance.
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