The crossfire has the two slots in the radio as most Mercedes Becker radios. The key simply unlocks the two clamps holding the radio in.

If anyone goes to an audio shop that has no clue.....Run to a different audio shop, no rocket science there.

As for the post above EXCELLENT radio choice in the CDA-9820XM.
Matches the dash and provides am/fm/cd/& xm radio built in. THe X Micro antenna is sold seperatly but that unit is a great bang for the buck.

Regards,