This has been mentioned before, and the problem (that Hugo and others have mentioned) is that the car dock is much deeper than the empeg, and so only a handful of cars will have the room behind the dash...

Jazz
(List 112, Mk2 12 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)
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Jazz (List 112, Mk2 42 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)