sash balance D 6 31 -126 what do i need

A handy person from california says:
i have older single pane, double hung sash windows.
the dimensions are 32 5/16 X 27 3/4" inside.
the sash balances have D 6 31 then -126 in a smaller font size stamped. my balances do not have the tab with the two screw holes. instead, the screw holes are about in the middle of the balance box.

will the new balances fit? what balances should i get?

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Paul from SWISCO responded:
Thanks for contacting us, Bill. Please see our 24-637 Andersen sash balance. This can be used to replace balance boxes with the stamp 6 31.
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