My 69 has the ashtray light, and it also has a cigarette lighter light. When I had the radio out years ago, I found these two capsule-shaped metal receptacles hanging behind the ashtray. The capsules each held a bulb, and the bulb was entirely enclosed, except for tiny hole in the metal, positioned right where the bulb sits, facing downwards, towards the clip. When I touched the capsule to a ground, the little bulb inside lit up. The only way the light can escape is through the little hole.
The metal capsule clips into the top of the ashtray, and the little hole lines up with a hole in the ashtray receptacle. When I turn on the lights, the ashtray lights up with a glow.
And then there's the cigarette lighter. Same capsule-shaped metal receptacle, and on the side of the cigarette lighter receptacle, there's the exact same slot as I found in the ashtray receptacle. I clipped this capsule to the lighter receptacle, and voila, the cigarette lighter hole is dimly lit. When the lighter is in the hole, no light is visible, But when the lighter is out, the receptacle itself glows with a dim light.
I don't smoke, but these two things seem pretty cool.
I've heard of the ashtray light before, but not one in the cigarette lighter. I "think" the Grand Prix may have had that, I'm not sure.