Mounts from the outside with screws. PLEASE, MEASURE in case mirrors for newer vehicle is attached your car
C-C between screws = 95 mm

Please note, for mounting on the right hand side it is not possible to adjust it like you could with the original one
Click on the link below to see how a customer of ours solved this issue:
Mounting rear view mirror

This part replaces part no 276612,1211279