Andersen balancer part numbers?

A quick learner from Roselle Park, NJ says:
Installed pic is right side looking out; removed is left side. The side with the Andersen Window logo is stamped 11600-17 near one corner and K4 8#27 7-87 near another corner. Side with 2 round indentations is stamped 11600-3. This side also has U.S. and CAN Pat numbers.

Which balancers do we need (both right and left needed)? Let us know if you need any other info.

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Bob from SWISCO responded:

Thanks for posting. See our 24-837 . This is meant to replace Andersen balances stamped 827 or 8#27 and will work on either side of the sash.

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