A CD player (ord DVD player) will not fit in the 16:9 display module. You are pretty much stuck with the cassette unless you want to totally rebuild the housing.

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SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input