Aero jumped from . Larger pinion bearings were fitted to manual gearboxes for 1989 to improve their strength and reliability. For 1990 eight-valve engine were taken out of production while a low pressure turbo engine with was available in European markets. ABS brakes and driver's side airbags were standardized for all North American market cars beginning with the 1990 model year. In the spring of 1990 the naturally aspirated 900i 16 Cabriolet was added. A 2.1 L (2119 cc/129 in³) (B212) engine was introduced for 1991. This engine was available in the United States until the end of the original 900, but in most of Europe, this engine was replaced a year later with the earlier B202 because of tax regulations in many European countries for engines with a displacement of more than 2000 cc. Front seats from the 9000 were standard from 1991 on and electronically adjustable ones were available as an option. Airbags became available as an option in Europe as well, while there was also an Aero version of the Cabriolet. The Saab 900 no longer offered the mesh wheels. There was also a change in the door locks, which carried over to the 900NG. For 1992 there were mostly equipment adjustments, with ABS brakes finding their way into most of the lineup everywhere. 1993 brought no changes, and "classic" 900 production ended on 26 March 1993, with a new GM2900 platform-based 900 entering production shortly afterwards. The final classic convertibles were still sold as 1994 models, with the Special Edition commanding top dollar in the resale market even today. In all, 908,817 Saab 900s were built, including 48,888 convertibles. Convertible In the mid-1980s, the president of Saab-Scania of America (U.S. importer owned by Saab AB), Robert J. Sinclair, suggested a convertible version to increase sales. The first prototype was built by ASC, American Sunroof Company (now American Specialty Cars). Similarly, Lynx Motors International Ltd produced two "convertible" models, just prior to the official 1986 launch. The Trollhättan design department, headed by Björn Envall, based its version on the 3-door hatchback while the Finnish plant used the sturdier 2-door version, which also looked better and was therefore selected for production. The initial production was not planned to be large but the orders kept coming in and a classic was born. The new car was shown for the first time at the Frankfurt Motor Show (IAA) in the