Where the wires go varies from year to year. The reverse lamp switch was originally inside the cabin. The switch on the trans had only 1 wire / one function, neutral safety. That was a brown wire routed continuously from the starter relay.
In 1969 model the reverse lamp switch was moved to the trans mounted dual function switch. The routing of the brown NSS wire ramained unchanged. Since the reverse lamp wires needed to go out of the cabin they simply put these 2 wires in a couple of the previously unused ports of the bulk head connector.
So at the bulkhead connector, far right member is mostly wiper motor connections. 2 additional wires found there that don't go to wiper motor are very likely reverse lamp wires.
