From memory, so obviously much room for error there, I think the last of the narrow body 4/4s was around 2004 with the Zetec engined cars, runabout and bespoke 4/4. Once the 1.8 Duratec engine came in for the 4/4 the chassis became the same for roadster, plus 4 and 4/4 so the internal width was identical the difference in width being in the wings.
