Lego Electric Plate 2 x 2 with Contacts

This size of electric plate was never produced by lego, I don't know of a prototype in that size.

Model of the plastic part of the Lego Electric Plate 2 x 2 with Contacts. You can obtain the metal parts from broken Lego 9v electronics. There is a fitting metal piece in the 4x14x4 battery box, I had one that was corroded beyond repair and used the metal plate from there. You can also cut larger metal plates to size.

This is best printed studs down.

You will need to melt the four plastic pegs sticking through the holes in metal plate with a soldering iron to fix the metal plate in place