1990 XJS have tilt-wheel steering column and drivers side airbag. In 1994, the 4.0 6-cyl and outboard rear brakes became standard. The 6.0L V12 option available through 1995. Replaced by the XK8 in 1996. Brake and suspension components virtually identical on all XJ cars since 1974.
All models have Lucas electrics unless otherwise noted.
V12 cars featured positraction rear axles. There are exceptions to everything. Your VIN is important because it is the final authority on when your car was built and what components apply to it. Keep you VIN number handy when ordering parts for your Jaguar. The VIN is typically located on the driver's windshield pillar or the driver's door or jam.