There are many options the first does it have round pins or square pins this can be found on the lead attached to the ISO conversion lead,then there are radios with inbuilt cassette,with inbuilt cd and inbuilt cd mp3,satnav with small screen and cassette,satnav tv with big screen and cassette and last of all large screen satnav,tv and cd.Look on ebay uk and for a better choice ebay.de.The basic cassette version is the cheapest,have you the alu frame behind the aftermarket radio you should have but if not you will need to install one no easy job as it requires removing a lot of the dashboard.
Plenty of advice on the bmw forums.
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