CAN bus TVS diode/EMI for motorcycle
You should use the NUP2105. The 120 ohm termination resistor is only for the two last nodes on the bus. It reduces the reflections on the line. The common mode choke is optional and is rarely used.

The purpose of the TVS diode is protect the transceiver against a harmful overvoltage condition. Each node needs one. The purpose of the common mode choke is to block noise.

By default I always galvanically isolate the CAN bus, using ISO1050 and SN6501.

Kvaser has a short tutorial on CAN bus. I suggest you read it.