Bob,
I am going to endeavour to fabricate the look of an original style radiator, and as I am not lucky enough to live in the states, and view a nice replica such as yours.
Would you mind clarifying two details please on the thickness of the top plate you have added to the radiator, and thickness of the rubber grommet bracket. It appears to be 2mm (0.0790) for the top plate, and 3mm (0.1180) for the rubber and pin bracket.
Yours the pedantic downunder cobra builder!