it looked like a simple transformation, no panels were interchangeable between the two variants. Subtle tweaks included a raised front spoiler, new side skirts and a bonnet that did without the SZ's artistically formed engine-cooling vents. There was also a new manually operated canvas folding roof that when lowered, disappeared from view underneath a traditional Zagato ‘double-bubble' rear deck. Other changes saw the arrival of a cut-down windscreen, new side windows, concealed windscreen wipers and smoked rear light clusters. Finally, thinner plastic panels were used in an attempt to reduce some of the extra weight caused by the reinforced chassis. Inside, the SZ's imitation carbon fibre dash was replaced by a matt black aluminium panel and buyers could choose from either black or red leather trim. Four exterior shades were also officially available, Rosso Alfa (red), Giallo Ginestra (yellow), Argento (silver) or Nero (black). One other car was reputedly finished in metallic white. Despite weighing 120kg more than the SZ, the 1380kg RZ was still an exceptional performer. Top speed dropped from 156 to 144mph due to the messier aerodynamics whilst 0-60 required 6.7 seconds. 278 were built between 1992 and '93, all of which were left-hand drive.