I'll really confuse the issue here. My 39 interior has a black knob on the drivers side, a black steering wheel, and a black knob for the headlights. The passenger side has the tan knob. I'm pretty sure that black was the color for 39.
According to the Chevrolet Pickup Buyers Guide the steering wheel color was changed from Black to 'Goodwood Beige' in 1940.
