Hey Guys,
I installed the spring-loaded trunk hooks (like in the A6) into my A5. Didn't take long. With the right nuts [US part number is: N-909-946-01 (Part Description: "Nut")] and some drywall style short screws (1 inch), the install took 15 minutes. I've attached pics of the hardware, hooks, and before and after. I removed the silver netting from the hooks easily for a cleaner look. The link below is for the hooks from Oempl.us.

Step 1. Slip nuts, using needle nose pliers, into square pre-punched holes.
Step 2. Align holes on hook and tighten screws using Torx bit
Step 3. ENJOY!

<img src="http://www.ewethehumanity.com/audi/hardware3.jpg">

<img src="http://www.ewethehumanity.com/audi/hardware1.jpg">

<img src="http://www.ewethehumanity.com/audi/hook.jpg">

<img src="http://www.ewethehumanity.com/audi/trunk1.jpg">

<img src="http://www.ewethehumanity.com/audi/installed.jpg"><ul><li><a href="http://oempl.us/index.php?main_page=product_info&amp;products_id=41">Hooks from Oempl.us</a></li></ul>

Didn't have a desire/need for the net, so I never looked into it. The hooks serve my purpose for groceries and for the my briefcase so they don't slide around in the back when I take fun drives..

That original website you linked to no longer has that part listed. do you have an audi part number for the grocery hooks so i can order thru the dealer?

Try this link, they changed it around. It shows backordered.
http://oempl.us/index.php?main_page=product_info&cPath=75_23_29&products_id=41