I believe they were started to be fitted in November 18 but I also know that some cars that were supposed to have had them fitted were missed. My dealer had to fit knuckles to a car that was supposed to have had them fitted at factory.
2017 GLC AMG43 premium plus, night pack, leather, intel lights, 360 camera, side steps. = sadly gone
Now GLE450 Premium plus, Selenite, Black/White Nappa leather, Tech plus pack, Driving assistance pack, Tow pack, Off road pack, 22 inch wheels.