Here is a photo of a Westerfield NWX reefer that I built last year. I used ACE gray primer from a spray can over a flat black primer for the color of the sides. Make your own decision on whether it is acceptable to you.
My belief is that you do not need an exact match, as the prototypes all look a little different depending upon where the car has been, the quality of the photograph and how long it has been between paint jobs. One can modify the original colors on a model through weathering so I never worry about an exact match.
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