Andersen replacement counter balance mechanism

A handy person from Needham, MA says:
I need a replacement counter balance mechanism for an Andersen double-hung window. Here are the numbers I can find on the part that needs replacement:

J16 5423 585

Also, if I want to replace both mechanisms, are left and right the same???
(the upper and lower sashes are essentially the same size)

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Paul from SWISCO responded:
The key stamp here is 5423. I'm willing to bet that 4 is something more like a "#" symbol. At the very least, the 4 may be printed differently. If so, see our 24-531. This can work for both the left and right side. If not, please take a few pictures of that stamp and we can work from there.
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