Anderson balances

A quick learner from MA says:
I have retrieved the bal. from the window. I'm confused on the size. When I look for it on your sight the numbers are a little different. What should I order for these #'s
And is there a left and right? or one can go on each side?????
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Casey from SWISCO responded:


An 827 stamp would be replaced by our 24-837 Andersen sash balance, which would use the same balance on the left and right side. Thank you!

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