Hi, I have a late 03 CL500. The Head unit has been tested as broken. Im in UK and have been looking on ebay, and breaker websites. There are none exactly the same as mine. The ones in the US have different buttons, there are some in the UK from different models but look the same. Does anybody know if any are interchangeable or if a US one would fit mine-and would there be a code problem. Thanks for your time.