I've got the Automobilista Photo Monograph on the Kubelwagen. The photos are of a Type 82 undergoing restoration. I do not know if they used correct colors or whatever they could find.
The front seats are black. The canvas top looks like a light stone color. The interior is mainly gray. The wooden floor slats are natural wood color. The dashboard bezels are black as well as the circular portion of the steering wheel, shift knob and wiper motors. The double rear seat is canvas, looks like a light gray green.
HTH
Rob Gronovius Modern US armor at
formatting link