brilliant. adapters for the lead in the back?!
how much do you want to spend... you can get changers with the necassary adapter box from places like this:
http://www.addacdchanger.co.uk/CD_Products/Factory_Fit_CD_Changers/Seat_CD_Changer/Option_2/Seat_CD_Changer_%28PACK_2_-_Alpine%29
pretty easy to be honest if you searched the forum as well