Or, if you don't want to hack about, you can get a fill-in panel and put a single DIN unit in. I've got a C2 with the 6006E in it and I'm quite pleased with it. It's the one with the 6 disc changed built in to the head unit itself rather than being a separate unit in the boot. Rumour has it that it doesn't get on well with non-original CDs (i.e. CD-R) so I haven't tried it just in case.