Please provide details of the M97xE terminals.
Use a bright light to see the letters RG - L - R - LG molded into the black plastic terminal panel. Looking at the rear of the M97xE cartridge body:
Upper left corner = RG = Right Ground = green ring
Next lower terminal = L = Left = white ring
Next lower terminal = R = Right = red ring
Lower right terminal with silver ground tab = LG = Left Ground = blue ring