mine rocked up and installed them. Seems the 2016 and later golf R have different mirrors (internally) what a pain to get those things swapped over! the interior parts are no longer alloy and looks like some sort of carbon/plastic mold instead... but the screws that hold the indicator leds in place foul on it and also makes getting the led lights out after you get the screws out very difficult. From the vids on line the alloy type seem to pretty much fall out after you take the 2 x tork screws out.
Anyway enough whinging but thought Id let people know if they have a later model Golf the install is not as simple as it would seem.