Help with schematic

Hi,
I was looking at a unregulated power supply schematic that
Mariss made, labeled DC Brush Type Servodrive E-Stop. In this
schematic Mariss made mention to a 20 watt wirewound resistor that
will be able to sustain the momentary power overload without damage.
My Question is: Does anyone know of a part number for a 20 watt
wirewound resistor or where to buy them? Any help with this would be
much appreciated.

John