Citroen XM FacebookTweetPin Citroen XM. The angular, dart-like Bertone design was a development of Marcello Gandini’s Citroën BX concept. It was a longer car with a longer, inclined nose, more refined details and with headlamps that were very much slimmer than the norm. FacebookTweetPin Related 1958 Chevy | Classic Cars 1956 Cadillac Series 62 Convertible | Old Car 1957 Chevy 210 1954 Desoto Diplomat 1965 Bentley S Type 1965 Chevy Nova | Old Car