Part # for C220 CD changer?

[useyourdagger]

I'm buying a friend's C220 (1996, no Bose) that's got the stock head unit and appears to be prewired for the CD changer. First, can someone provide the part # for the CD changer? There are a bunch of them on ebay and I'd like to try one before switching to aftermarket. Second, is the CD changer wiring in the trunk, or is that what's in the bottom of the console? I think the console may be phone wiring but wanted to check as the previous owner wasn't sure. Thanks.