If you buy a GM Approved Speaker Grill the dark color of the bars is a deadnuts match to the original color of my dashboard. I'm just having paint mixed to match that color which I THINK is PPG27467 Graphite Brown Metallic. Beyond that, you're on your own.
The exterior color stops at the edge of the body sheetmetal.
No black dashboards your year.
Can't help you with your Turquoise Blue question.
