Please remember we are only talking about parts here to suit the stock single piece waterfall design centre stack. It meets the gear surround trim at a sharp angle.
Your G8 has the Waterfall design single piece centre stack from factory.
If you have changed out the stock waterfall centre stack and installed HSV triple gauges or a GPS pod then you now have a Calais 2/3 height centre stack which meets the gear surround with a radiused curve. The Calais curved stack requires a totally different style of gear shift surround trim than we are talking about. Also GPS pods will not accept the style of horizontal dash appliques we are currently talking about.