Dedicated frame for M-Benz Mercedes Benz W251, for the original dash opening.
It covers the gap between the dash opening and the screen, so the fit looks factory.
Fascia adapter dedicated and tested for M-Benz Mercedes Benz W251, R300, R350 (2006-2014) turns the original dashboard aperture into a perfectly calibrated housing for a modern Android screen - with no modification whatsoever to the dashboard.
The figure refers to the screen diagonal for which the inner cut-out is made - not the outer size of the fascia.