http://www.vwwatercooled.com.au/foru...530[2]-jpg
The speaker housings on the second hand Dynaudio speakers I got were kind of butchered when they were removed from the previous car.
On the left is the stock speaker and housing. You can see the horrible butchered holes on the right-hand speaker.
The drill bit was obviously allowed to get hot and melted the plastic whilst removing the rivets.
Luckily the housings are removable, which has the added advantage of being able to use the 4-pin connector and crossover from the stock speakers.
I'll have to live with one rear stock speaker for now as a single rear woofer will be hard to come by. The one which is faulty has a big crack across the rear housing which explains why it doesn't work. Must have taken a really good hit because these things would be hard to kill..