Here's an article I found from a website I used to maintain, dated 9th February 2005 about the X1/99;
"Fiat are expected to unveil another concept car at the Geneva Motorshow in March which could well make it into production. The Fiat X1/99 which has been designed by The Istituto Europeo di Design (IED) has been sanctioned by Fiat for further development.
Based on the new Punto platform (Progetto 199) the X1/99 is a coupe/cabriolet with 2+2 seating. The name of the car suggests that Fiat intend it to be the spiritual successor to the X1/9, the seventies roadster which has now reached classic status and has a large following."