CD Changer for 2003 Discovery SD

I just purchased a 2003 Discovery SD. It has an aftermarket cd player, and I am looking to return everything to factory and add a cd changer. I purchased online part number XQD000340PUY:

http://i11.ebayimg.com/03/i/07/6b/2e/74_1.JPG

This is the factory unit which I believe comes in the SE models. I would like to know the exact part number (either alpine or land rover) for the cd changer that will work with the alpine unit i just purchased. I checked under my seat and the vehicle is wired to receive the cd changer.

If you do a search online for the item I just purchased (XQD000340PUY), you will come across an incorrect link which refers to that part as a Philips. Thank much guys.

Alex

Not sure if it helps, but i've just bought a 1995 V8 ES, which has a 6 disc multi changer under the drivers seat, if it's any good to you, I'm happy to sell it, coz I've gone all new fangled mp3.