Adapter to fit a led light into an Astra H. Currently I use one printed with PLA and 15% infill. The heat from the led light won't affect the adapter (yet). To be sure, print with a more heat resistant filament.
For the best fit in the car, unscrew the screws in the headlight a bit, rotate the adapter untill it can't move any further and tighten the screws again.
The author hasn't provided the model origin yet.