Welcome Brad:
I'm not from Minnesota but I'm sure you can take the measruements of the pane to a local lumber yard and special order the new pane. It is not a good idea to replace the inner pane only because the space between the glass needs to be evacuated, dried and permanently sealed to the divider strip. Otherwise, you will have condensation, frost and a smoky apperance between the layers.
Any window dealer will know how to order the complete glass unit, which you can then install in the present sash.
Glenn
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