cd changer compatability ?

[Ron]

Hi all,
I've just bought a VDO RB 3-00 radio/cassette HU for my girfriends 51 reg 206 to replace the single in dash cd player , does anybody know if the Clarion cd changer from a 51 reg 206 would be the one I need to go with it ?, or which cd changer is the one I need ?

Thanks for your time,
Ron