A lead assembly includes an implantable lead. Electrodes are disposed along a distal end of the lead in an electrode array. Terminals are disposed along a proximal end of the lead in a proximal-most terminal array and a medial terminal array. A terminal extension electrically couples to the medial terminal array. A port is defined in a connector at a first end of the terminal extension. The port has a first end and an opposing second end and forms a continuous passageway therebetween. The port receives the medial terminal array. A contact array includes connector contacts that are disposed within the port and that couple electrically with a terminal array disposed along a second end of the terminal extension. The contact array couples electrically with terminals of the medial terminal array of the lead when the medial terminal array is received by the port.