To remove them, you have to slide them toward the rear of the car before you can pull them out. There's a little clip in there, and I find it easiest to take an old credit card and slip it under the front of the marker and use that to help you slide it back.
A forum community dedicated to BMW owners and enthusiasts. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! Bringing the BMW community together.