So as the new owner of a 07 G, I'm trying to fix little things that are wrong with the car. Of course I had the "auto close" feature on the doors. These coupe doors are heavy!
I bought one replacement door stopper, but it was like $50. Then I saw this video on youtube. It's ridiculous, but was super easy and dare I say it might even work better than the replacement I installed on the driver door. To be fair, I just did this today, so we will see how long it holds up.

 

Nice. Ima have to do this to my doors as well.