W463 Sun visor
When I lower the sun visor on the driver's side it hits the rear view mirror. I guess this is just bad build quality on my vehicle as it can't possibly have been designed like that can it?
Might depend on what year your G is but have just checked on mine (1993) and the answer is "no" it shouldn't get anywhere near to hitting.
I would think it can only be one of two things :-
1/ Someone has replaced the visor with an incorrect item or
2/ Someone has replaced the mirror with an incorrect item
When the visor is UP it sits nicely into a slight recess on the headlining (do you have that recess). If it does fit in there then it's the mirror that's the problem.
Have just measured the items in my G (pretty sure both are original to the car) and they are as follows:
Visor 47cms wide
Mirror 23cms at its widest
Gap between mirror and visor when in the down position is 4cms
Hope that's of some help.