Replace those worn or missing Air Cooled VW Check Rod Stops with a fresh pair. These stops take a good beating from opening and closing your doors, so it is not uncommon for them to have to be replaced at some point.
These stops install on the inside of the door where the rod extends out and attaches to the body. They are designed to soften the jolt of opening your door too hard. Comes as a Pair for both Driver's Side and Passenger's Side.