Replacement of mirror glass and cover:
The mirror glass is contained in a plastic carrier which includes the heating element and terminals. To remove the glass, press the glass so as to expose the outer edge, and carefully ease the outboard end from its carrier clip. Then unhook the inboard end, unplug the two heater cables, and remove the glass. Check that the adjustment racks have not become detached from the gimble during disassembly.
To refit, connect the cables (either way round), hook on the inboard end of the glass carrier, and press the outboard end until the clip is engaged.
Note that convex glass is normally fitted to both sides in order to provide the widest field of vision, but certain markets use flat glass on one or both sides. Be aware that objects viewed in convex mirrors appear more distant than when viewed with flat glass.
The painted cover is secured to the mirror body by integrally moulded clips. To remove a cover, first remove the glass to allow the lower clips to be eased, whilst the lower edge of the cover is carefully prised away.