Andersen Perma-shield Narrowline 3456 & 3856

A quick learner from Charlottesville, Virginia says:
Please help me identify both left and right balances for the above Sizes/Model Numbers. I couldn't get a clear photo of the balance, but the existing right balance on one of the 3456 Windows has the following stamp:

BP25 12 # 27 2-88
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Tom from SWISCO responded:
Based on your stamp of "12#27," I recommend our 24-1231 Andersen sash balance. Check it out and see what you think.
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