Which headunits will work with Gamma 6 disc in dash changer?

[barnum7]

Passat b5.5 highline looking to swap standard tape deck headunit for a bluetooth one but keep the six disc changer below.

had a look at this http://www.caraudiocentre.co.uk/product ... -23324.htm

Any ideas what might work, or how i can do it. All advice appreciated.

Thanks, in advance.