AG Big 300

[Lea]

I came across a acklands Grainger 300 amp welder at a good deal (I think) I think they are made by miller, not positive tho. It needs a governor, it has the 3 cylinder continental engine, it also needs the exciter housing on the back, you know the aluminium cast housing that holds the brushes at the back of welder and holds the brushes and the rotor in place, does anyone know where I could get new or used parts for it?
Thanks