While I'm not completely sure about the Crossfire, I am responsible for the same part at the OEM that I work at. Our vehicles have a clip at the front and rear of the car to secure the ends. The rest of the molding is press fit in the channel bwtween the roof and side panels. To remove them start at the rear, pull the end straight up, once the clip is disengaged pull the rest of the molding out of the channel and then disconnect the front clip.

Again, not sure if the Crossfire uses a similar design, but it might help you.