FWIW sharing the insides of the Inside Rear View Mirror Part #: 477-857-511-B-01C-OEM $150 retail. My day/Night tab broke on my mirror with good glass and works on a mirror with a bad glass. It is press fit. Hard to get out and would be very hard to replace with the good mirror unless I heated it up? In the meantime I attached a 1999-2005 VOLKSWAGEN PASSAT REAR VIEW MIRROR Black IE10110093 to my mirror arm . Just slightly bigger- works.

Together with arm

Apart

back side

Night

Day