Well, the only part we butchered and replaced were those four wires (they were four different colors; I remember that much). We took the four off the Classic II and used them on the SE/30's power (P1) connection. When we decided to reassemble the Classic II, we used four wires from a standard power cable (like one of the molex cables to attach to hardware) off an ATX power supply, putting a male molex connection on one set and a female on the other so we could connect the analog board to the yoke assembly.

The wires we replaced are the four on the top left corner of the analog board in this photo: