Rhodes 88 Suitcase Piano extension Cord with no Ground??

[isaacalfaro]

Hi All, I am resubmitting this question because I may have phrased it poorly in a previous post. But, my Cabinet on the 88 Suitcase piano has a 2 prong male plug for power. So i have to run an extension cord with 2 female slots to accept the Prongs. My concern is there seems to be no indication of which prong is + vs - nor is there a ground. Does it matter how it's plugged in regarding the +/-? Has anyone upgraded this power supply to take a ground? See image. Thanks!!

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[isaacalfaro]

Nevermind.. i just realized the ground is missing.. i ordered a new plug from vintage vibes..