I'm a car enthusiast in Italy and would like to fit a Becker navigation/radio system to a 2002 Audi A2 that I am refurbishing. I am asking myself if it is possible to know the chronology of the various Traffic Pro Beckers, for example, is a BE 4730 I bought some time ago older or newer than an Indianapolis 7920 or a 7820 or 7822? I'd like to know as it would be better to buy the newer possible equipment. Becker, of course, doesn't answer.... Thanks for your help, Stefano