Lincoln SAE 300 spares

[MIKES]

I would like to overhaul my old Lincoln diesel welder but before I start, I need to find some parts. Does anyone know of a U.K. source of parts for these welders? This is a genuine 'old' Lincoln with a Perkins 3.152 engine and a proper D.C. generator.
It's been a very good welder and therefore I would dearly like to extend its life . Engine parts aren't a problem, it's mainly the generator and auxiliary parts that I'm in need of. Any pointers gratefully received.