Quote from andrew
The IO Pi Plus was designed to worth with the MOLEX 90130-3220 right angle connector or the 70246-2004 style straight connector...
Thank you Andrew, that was very helpful!
One more question. On the power connector I can see that it has holes for the 5mm screw terminal PLUS two more holes. Is there a specific socket that was designed for? There isn't a dimension on the two extra holes.