[steamship]

Probably best to explain this with pictures, rather than words.

For the first picture, highlighting the undertray (#10) highlights all the associated parts, 11-17, but ignoring #16 for now. You will see the various fasteners highlighted at the bottom of the image, and to the right, you'll see the corresponding part numbers, and the total of each one required. For part #11 (8K0805121), replace that with part number 8W0805121 as it's newer and cheaper. There are two part numbers for #14, but I can't find anything on which one is the correct one.



To attach part #16, I've attached a second image that #16 links to. In this one, there appears to be two parts, and I believe it is #18 in this case, but have no way of confirming as the part is quite different in appearance on them. Part numbers #19 and #20 are required.



I checked the prices of some of these on eBay, compared to the official price list, and the eBay ones are considerably more expensive, so I'd suggest contacting your local Audi dealer for prices, and also for confirmation on these being the correct parts needed.