IBM T30 Power Connector Question

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HI All,
I have an older PowerExtender for plugging into an auto 12Volt system
with a suitable output voltage/current rating but the wrong connector
tip to fit my T30. A replacement cable is no-longer manufactured and I
like hell to buy all new. I'm perfectly capable of soldering a new end
on the cable but not sure which is the correct one. Anyone know what it
is and where to find one?

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