Johny,
The only place to get NX teach pendant cable connectors is from Motoman, attached to teach pendant cables. Working for Motoman Canada we found the connector manufacturer and asked for the parts and tools to replace broken ends. Their answer was "we are under license to sell these connectors to Yaskawa Electric Japan only!" We tried to explain we are one in the same, but it was a no go.
By the way, we had a customer replace the cable ends with something they could get locally and got wires crossed up and blew up the power supply, main CPU, Pendant CPU and back plane for the rack. About $16,000 in parts not to mention the new cables and harnesses they had to buy.