The file 'Astra J Phone Stand 3D Printer Model' is (skp,stl) file type, size is 158.2KB.
Opel Astra J has a big issue when it comes for adding a phone stand since the blades of the airducts are vertical and cannot keep a good position. The pin is 6mm in diameter.
This modeling started from https://www.thingiverse.com/thing:2538673. Also the design file is attached in case additional changes are needed - is a Sketchup Maker 2017 file.
This design is using the edge of the multimedia area and is offering a generic pin which can be used as you need. In my case I've used a generic/cheap magnetic holder resulting in a very small and nice phone stand.
phone_holder.skp | 203.0KB | |
phone_holder.stl | 143.9KB |