CDR-210 to CDR-220

[elav]

I found a good deal on a Becker CDR-220 radio so I figured I would replace the CDR-210 that is currently in my Boxster with the CDR-220 so I can use the CD changer function to run a plug to my iPhone so I can play music from there.

It turns out that the body of the CDR-220 is slightly wider than the CDR-210 and won't fit in the CDR-210 mounting cage that is in the car. Do I need to find a mounting cage for a CDR-220 or if I simply remove the cage, will the radio latch onto the plastic? Any guidance is appreciated!