Window balance

A home owner from Asbury New Jersey says:
Anderson Window balance replacement needed. numbers on the box stating BP6 12R 10-8. The 10-8 is hard to see on the box, unsure if there is anything after the 8.

Not sure if these are right vs left? Or universal.
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Paul from SWISCO responded:

Hello!

For your right and left balance, we recommend 24-13L for the 12L stamped balance box and 24-13R for the 12R stamped balance box. Take a look and see what you think. 

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