G'day Joe. My father used SHEARER PLOUGH'S and CULTIVATORS on his farm in the Murray Mallee near LOXTON, SOUTH AUSTRALIA, AND MY RECOLLECTION OF THESE UNITS - regarding colours was as you stated ---------a pale medium dark green with cream wheels and cream pin-striping on very early ploughs.
I have a very big collection of old plough's, starting with horse-drawn single, double, tripple - right up to 13 furrow, and including some roll-over or reversable single and double marlboard and disc. All various makes. All the best with your restoration project. Shubys Tractor Farm.