Myson Super III resistor?

Is it possible to obtain a replacement resistor for a Myson Super III fan assisted radiator? It is rated at 320 ohms in two sections of 160 ohms. The identification on is ED16242 at one end and ERG 86 23 at the other with 160R 5% over the top. One terminal at either end and one in the centre. The centre terminal has nearly rusted away, and it would be pretty easy to fit a new one - if I can get one!