Anderson Counter Balance

A home owner from Morgan Hill, CA says:
The part is 6 1/4" x 3" x 3/4" plus a small flange with the staple in it.
There are two numbers, on is U7 1131 4 89 which might be a date code since it was installed in 1989. The other number is 11600-17. I need both left and right and I need them for two identical windows.

Can you send me the price and availability.
User submitted photos of a window balance.
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Paul from SWISCO responded:
Based on your stamp of "1131," I recommend our 24-1133 Andersen sash balance.
A quick learner from Morgan Hill, CA says:
Are these in stock and available to ship right away?
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Tom from SWISCO responded:
Yes, we have these balances in stock.
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