OEM parts categories for 1990 Buick Riviera: Body Moldings, Sheet Metal, Rear Compartment Hardware, Roof Hardware (Lid/Folding Top Stowage Compartment, Moldings/Body, Pass Through Door & Hardware/Rear Compartment, Rear Compartment Hardware & Trim, Roof/Landau Top, Sheet Metal/Body-Engine Compartment & Dash, Sheet Metal/Body-Side Frame, Door & Roof, Sheet Metal/Body-Underbody & Rear End, Sunroof) | Body Mounting, Air Conditioning, Audio/Entertainment (A/C & Heater Module Assembly, A/C Compressor Assembly, A/C Compressor Mounting, A/C Control System, A/C Refrigeration System, Air Distribution System, Antenna/Electric, Body Mounting, Cluster Assembly/Instrument Panel) | Body Wiring, Roof Trim (Folding Top Cover) | Brakes (Brake Booster/Vacuum, Brake Hoses & Pipes/Antilock, Brake Master Cylinder-Antilock, Brake Pedal & Master Cylinder Mounting, Brake System/Antilock Electrical, Parking Brake System) | Brakes, Rear Axle, Propeller Shaft, Wheels, Tires (Wheels & Wheel Covers) | Cooling System, Grille, Oil System (Engine Coolant Fan, Grille/Radiator, Hoses & Pipes/Radiator, Radiator Assembly) | Engine (Engine & Transmission Mounting, Engine Assembly) | Frames, Springs, Shocks, Bumpers, Fascias (Bumper/Front, Bumper/Rear, Level Control System/Automatic, Suspension/Rear) | Front End Sheet Metal, Heater (Hoses & Pipes/Heater, Moldings/Front End, Sheet Metal/Front End, Spare Wheel Stowage & Jack Parts) | Front Suspension, Steering (Drive Shaft/Front Wheel, Steering Column/Tilt, Steering Gear Assembly-Power, Steering Pump Assembly, Steering Pump Mounting, Steering System & Related Parts, Steering Wheel & Horn Parts, Suspension/Front) | Fuel System, Exhaust, Emission System (Accelerator Control, Air Intake System, Cruise Control, E.C.M. Module & Related Parts, Emission Controls, Exhaust System, Fuel Injection System, Fuel Injector Rail, Fuel Supply System, Throttle Body) | Interior Trim, Front Seat Trim, Seat Belts (Folding Top/Hardware, Inflatable Restraint System, Seat Assembly/Front, Seat Belts-Rear, Seat Belts/Front, Trim/Front Door, Trim/Lock Pillar & Quarter) | Maintenance Parts, Fluids, Capacities, Electrical Connectors (Normal Maintenance Replacement Parts) | Rear Glass, Seat Parts, Adjuster (Adjuster Assembly/Manual Passenger Seat, Adjuster Assembly/Passenger & Driver Seat, Lamps/Interior-Dome Courtesy & Reading, Lock Assembly/Seat Back Recliner) | Rear Seat Trim, Carpet (Seat Assembly & Back Window Shelf/Rear) | Starter, Generator, Ignition, Electrical, Lamps (Alarm System/Anti Theft, Coil & Module/Ignition, Electrical Miscellaneous, Generator Assembly, Generator Mounting, Lamps/Front, Lamps/Rear, Starter Motor) | Transmission - Automatic (Automatic Transmission Case & Related Parts, Automatic Transmission Case Channel Plate, Automatic Transmission Case, Drive Link, 4th Clutch & Accum, Automatic Transmission Governor Feed/Shift Accumulator Parts, Automatic Transmission Internal Power Train Parts, Automatic Transmission Oil Cooler Pipes, Automatic Transmission Oil Pump, Automatic Transmission Park Lock & Inside Detent Lever, Automatic Transmission Valve Body, Shift Control, Vibration Absorber/Drive Line) | Windshield, Wiper, Mirrors, Instrument Panel, Console, Doors (Console/Floor, Door Hardware/Front, Instrument Panel, Mirror/Rear View-Exterior, Mirror/Rear View-Interior, Sunshade Assembly-Mirror/Vanity & Sunshade, Wiper Motor/Windshield, Wiper System/Windshield)