I just talked to a company that does all aftermarket work for a Frod dealership here in OH and he told me that the 05 in-dash 6 disk changers are different thatn the 04's. I know that the one difference between them is that the 04's will not play mp3 and the 05's will. But he told me that if you want to change out a single cd for the 6-disk headunit, they need to reprogram the headunit because the headunit has your vin info on it and will only play in the vehicle with the current vin. He said that because delphi makes the radios now, there has been a lot of headaches to switch out factory headunits. Is this true? I was looking at getting an 04 6-disk for my 05 on e-bay. I don't need the mp3 capability. He thought I would be ok because this new development only has affected the 05 f150's. What do you all think? Thanks.