Uhm, Al ...
... Isn't it the other way round?
Odd numbers (7th and 8th digit) are for left side and even numbers for the right side ...
The numbers for the both mirrors changed a few years ago.
A1108100916 is the old parts number which changed into 0716 and thus means left-side.
Ouch !!!
Just checked the parts availability on the DB homepage:
A1108100716 is the left side rearview mirror and is currently priced € 60.35.
But the right side was a very few years ago (1997) the same price, now it is slightly above ...
A1108100816 (€ 182.07) ... :x
Seems to be that they run out of the part soon...
The gooseneck mirrors can be easily distinguished. :| The left-side neck (i.e. the upper round attachment for the mirror itself) turns rightwards to the car; the right-side neck turns leftwards to the car.
The mirror backside itself (the round chromed back of the mirror) says "110 L" for the left side and "110 R" for the right (although you could theoretically switch both). BTW, it's not the 3-pointed Mercedes star you see on these parts; it's any brand logo of the supplier. Don't know who that was... Neither Happich nor Huf nor Bomoro ...
Oh boy, good luck for hunting!
Best,
Achim
(Magdeburg, Germany)