The color is "Nightwatch Blue". Reach out to Ron Randall at
Metal Morphous...last I heard he still has the car.
Also, here is a dark blue that is not quite as dark in full sunlight but turns very dark in indirect sunlight and black in the evenings and night:
You might want to take a look at '98 Rolls Royce Royal Blue Metallic or '98 Rolls Royce Ming Blue and experiment a little. This car is offically labeled as the former but I think the real mix was the latter.
Drew