I bought and fitted the full Audi jack pad kit to my MK7 Golf GTD in August 2017. I ordered the parts from my local Audi dealership. Oddly, my local V.W. dealership could not order the parts as they are Audi parts, not V.W.
You can buy just the bungs as per the ECS ES#251835 kit which will be a bit cheaper I imagine but if you are going to do it, do it right would be what I'd say and buy the full kit with the correct rear pads and front trim pieces that mate together with the front pads.
Below are the part numbers of what I ordered. Everything fitted perfectly and works very well. The only thing I will say is the plastic surface of the front and rear jack pads is quite hard and slippy (as most plastic tends to be) so I would suggest using something grippy in between the jack and the pad if you are using a jack with a metal piece or cup that contacts the car to avoid any risk of the car sliding or moving on the jack. If your jack has a rubber pad built in as many do then all is good. Mine does not and the first time I went to use the pads after being installed I noticed the car shifting a little which got my heart rate up and I quickly dropped the car back down again before it had a chance to fall off the jack so I now use a little strip of rubber in between the jack and the pad. Worth noting is that the ground I was jacking up on was not perfectly flat so the car was not level but I still wouldn't risk it. It would be a right mess if the car did slide off the jack
I jack with the pads and then place an axle stand on the pinch weld and this works well. I also use a strip of tougher rubber here which I have glued to my axle stands, just to help limit any damage to the pinch welds or disturbing the anti corrosion wax as much as possible. There is no chance of the car slipping off the axle stands that I use as they are curved upwards at the edges but the rubber works as a nice little buffer when the car is shifting slightly when you are jacking up or down from another point on the car.
1x 8V0 825 271, Large outer trim cover left side
1x 8V0 825 272, Large outer trim cover right side
2x 8V0 804 631B, Base plate for jack socket
1x 8V0 802 845, Jack socket left side
1x 8V0 802 846, Jack socket right side
2x 8V0 802 847 A, Jack socket rear
I wouldn't have any concerns over the strength of the points for jacking. I accept that they have most likely been designed to only be used on a four post lift but if you do one at a time and place an axle stand at that point on the pinch weld before moving on then the full weight of the car is never on one single point as either the other wheels are on the ground or if not there is a jack stand at that wheel taking the weight. I wouldn't leave the car on the points while working, just jack it up then place the weight on the axle stand on the pinch weld.
Here is a picture of the same kit that I bought.
free image hosting
Hopefully this info is helpful