MKIV, CCC, and NAVIxx parts are not the same and not compatible. Everything is different between these different systems, and you can not use parts in cars designed around the other systems.

Going back to Matrix's original post, I believe that he is looking for the internal CD/DVD loading and reading mechanism for his MKIV. That is not sold as a separate part by BMW. Therefore, he would have to buy a broken MKIV and scavange the part from another unit. He would not be able to use internal parts from a CCC nav computer or a NAVI02 or NAVI03. They are different.

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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