2A on the schematic - part # 191 501 159
(https://volkswagen.7zap.com/ImgsWatermark/images//Bilder/070/070106000.png)
I could stand to be corrected but I believe the hole in the stub axle (and corresponding one in the backing plate) is there to allow the pipe union for drum brakes and is redundant on cars with discs.
Even it's not it still leaves a biggish hole and VW appear to have filled it with the above plastic bung.
I've just put in all new hardware and if they were included I didn't get them, though Googling turned up someones last two for 84p each!
It also brought up this link to 'Thethingiverse' where some generous person has made a 3D printable programme available for free.
One for Monkey perhaps, if there's enough interest to cover the cost of his making them?
TheThingiVerse (https://www.thingiverse.com/thing:4080642)
Not for speed sensor?