The connectors on the X3 line (X3 Probe Interface) are Molex PN: 5050663422. The mating connector to be used is Molex PN: 5050703422.
For X6, the connectors on the headstage (X6 Probe Interface) are Panasonic PN: AXG144144A, and the mating connector is Panasonic PN: AXG244144A.
Engineering drawings are available in the Download section.