What you need to do is look at the plug on your sewing machine. Any cord that you purchase would need the appropriate plug that will fit the one on your machine. If your power cord also includes the foot control, you'll need to also be sure to get everything that is needed to run your machine.
You can search for:
Make Model power cord
and see what comes up. Then compare the description/picture with your machine.
https://www.sewingpartsonline.com/viking-300-sewing-machine-parts.aspx
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