Just gone to have a look at mine.
Looks a nightmare job to replace the entire unit.
If it's only the glass/housing that's damaged then it shouldn't be too bad. You have to careful not to break the plastic locating tabs when removing and fitting the bit that surrounds the glass (been there, done that)
If I were you, I'd take it to an approved Land Rover garage (not a dealer) and ask them to fit for you.
Good luck!