I will circle it and repost the pic, but basically it is the finger size hole in the upper right of figure 7. If you put your finger in there, you can even feel the bottom pf the grill cover. Should take a few minutes to find the photo and circle it, but I will add it to this postr when I am done.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E