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Mark 1-3 are CD based, they have different numbers due to different production dates and of course, euro and US. But of course, MK3 is better than Mk1 and should fit most BMW cars. As far as the screen goes, they come in 2 sizes, the 4:3 and the 16:9. E46 has its own screen size, exclusviely for 3 series vehicles only. Older 5 series and X5 shares the same size of screen. Like the nav computers, they have different production dates.
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