Andrew
I am sure that I did see a 6 cyl which was painted grey by the OEM, it had the Clayton-Dewandre in-line brake booster so must have been very early for a 6 probably 1967 and may have been an import.
Otherwise it would have followed the Pressed Metals Corp philosophy (based on Henry Ford's model T one - "you can have any colour you want as long as it's black") of you can have your Land Rover in the colour we make it, 88" bronze green, 109" grey and 6 cyl Sandstone. If you want a roof it will be limestone.
Diana

