Here are a few more pics of an original Yenko installed Deuce wheel for reference.
The windows of the wheels on this particular car appear to be flat black. I think 35+ years of crud and sun fading may give it a slightly charcoal appearance. These were late April dated wheels.
Now here is a pic of a "factory installed" Magnum 500 that was on a very low mile unrestored 69 L-78 Chevelle. It definitely appears to be more charcoal in color.
Here's a shot of the light grey backside on the original '69 Firestone Wide Oval spare.
