and more than seven inches of length was added behind the door and ahead of the rear wheels. The spare tire was relocated to the new space behind the driver's seat, and a third seat was added to the space behind the passenger seat originally used for the spare tire. "Opera" windows were added to the sail panels. The stock 1.5L engine was replaced by the 2.0L DOHC FIAT engine to add more power to compensate for the added weight. The X1/9 "Passo Lungo" was based on a European specification 1500 Fiat X/19 with a stretched wheelbase of to accommodate a back seat, usable only by small children. Only one example is known to exist which is currently on display with the Bertone collection in Volandia. In stretching the body, the targa roof also had to be made longer and could no longer be stowed in the front boot of the car (as it had been designed for in the normal X1/9). Fiat X1/9 Spider The third study was a full-convertible top (Spider) version of the X1/9. The fixed rear window and sail panels were deleted, and a more conventional roll bar/hoop was added for rollover protection. A fascia was fabricated to mate with the engine compartment lid to cover the body shoulders where the sails panels used to be. The convertible top is not a structure that emerges from behind the passenger compartment area; rather it is a flexible cover that mounts using the original targa top clips along the windshield in front, stretches over and is supported by the new roll bar, and is secured into place in the rear with twist-clips. Racing Filipinetti The Filipinetti X1/9 of Scuderia Filipinetti was presented first at the Geneva Motor Show in March 1973 as the first Fiat X1/9 race car. It was built in cooperation with Fiat by the technician and racer Mike Parkes who later developed and built the Lancia Stratos. The Filipinetti had a 1290 cc engine with Lucas mechanical fuel injection and a Colotti five-speed gearbox. The power was about at 8600 rpm with a top speed of . Abarth The Fiat subsidiary Abarth, in 1973, developed the Abarth X1/9 Prototipo to replace the 124 Spider Abarth as Fiat's main rally car. Ultimately, the parallel 131 Abarth project was chosen over the X1/9 as the main rally competition platform. The X1/9 Prototipo used an 1840 cc engine