Andersen Counter Balance Sash

A home owner from St. Louis says:
I have a wooden window that is 48in x 54 in. I need to replace sash counterbalance on both sides. The piece measures about 6 1/4 x 2 3/4

I have the part out but the only numbers I see on the piece is 12 31 52 The (52) looks like a smaller number than the other two.

Thoughts?
andersen balance
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Paul from SWISCO responded:
Based on your stamp of "12 31," I recommend our 24-1231.
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