They list a few different bumpers, with and without towbar option and with and without sensors (and there are also different bumpers depending on licence plate size). You would have to confirm which one fits yours from your VIN/option codes fitted. I believe in the Polos case the bumper for the sensors just has a proper hole pre-drilled. So you might get away with drilling out your bumper carefully with a step drill - there would hopefully be a mark on the inner skin where the holes go. They have to be in the exact location for the mounts to glue on properly as they are shaped to the curve of the bumper skin.
It looks like the sensor mounts are actually glued to the back possibly as there are some mounting parts listed below for the sensor to mount into.
So these should be the parts (
confirm with dealer).
4 x Sensors 3C0919275SGRU - require painting
(4 x O-ring seal 1T0919133C9B9 - may come with sensor anyway)
1 x bracket - left outer 6R0919491D
1 x bracket - left inner 6R0919491E
1 x bracket - right inner 6R0919492E
1 x bracket - right outer 6R0919492D
1 x control unit 6R0919475 - will integrate with vehicle electronics properly
1 x bracket for control unit 6R0971362B - also holds factory trailer module if fitted
1 x buzzer 8E0919279
2 x split rivets N0385051 to mount buzzer to bracket
1 x wiring harness for rear bumper park sensors 6R0971065
May also require these extra parts to mount module:
1 x base 867955499
4 x split rivet N0385051
Again, you will need to see whats inside your bumper at the moment - especially whether there are any markings in the proper spot.
I would just order one of the mounting brackets, say - left outer 6R0919491D - just to see what you actually are getting and go from there. If its just a flat adhesive bracket that doesn't clip into something on the inner skin then you would be good to go getting some holes drilled yourself into existing bumper. They have to be pretty exact as well so everything is tight - the sensors are actually slightly tapered where they go through the bumper skin (or at least the O-ring is) so the hole has to be drilled from inside.
Good luck.
(This is how I am trying to mount sensors in my R32 - that's why I have researched all this stuff before.)
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