OEM parts categories for 1998 Buick Riviera: Body Moldings, Sheet Metal, Rear Compartment Hardware, Roof Hardware (Moldings/Body, Rear Compartment Hardware, Sheet Metal/Body Quarter & Deck Lid, Sheet Metal/Body-Doors & Roof, Sheet Metal/Body-Engine Compartment, 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/Power, Audio System, Body Mounting) | Brakes (Brake Booster, Brake Caliper/Front, Brake Caliper/Rear, Brake Electrical System/Anti-Lock, Brake Hoses & Pipes, Brake Master Cylinder, Brake Pedal & Master Cylinder Mounting, Brake Pressure Modulator Valve, Parking Brake System) | Brakes, Rear Axle, Propeller Shaft, Wheels, Tires (Wheels & Wheel Covers) | Cooling System, Grille, Oil System (Engine Block Heater, Engine Coolant Fan, Grille/Radiator, Hoses & Pipes/Radiator, Radiator Assembly, Radiator Mounting & Related Parts, Tensioner/Drive Belt) | Engine (Cover/Transmission Converter, Engine & Transmission Mounting, Engine Assembly-Cylinder Block & Related Parts, Engine Assembly-Cylinder Head & Related Parts, Engine Assembly-Front Cover And Cooling, Engine Assembly-Manifolds & Fuel Related Parts, Engine Assembly-Oil Pump, Pan & Related Parts) | Frames, Springs, Shocks, Bumpers, Fascias (Bumper/Front, Bumper/Rear, Level Control Compressor/Automatic, Level Control System/Automatic, Suspension/Rear) | Front End Sheet Metal, Heater (Hoses & Pipes/Heater, Labels, Sheet Metal/Front End, Spare Wheel Stowage & Jack Parts) | Front Suspension, Steering (Drive Axle/Front, Steering Column, Steering Gear Assembly-Power, Steering Pump Assembly, Steering Pump Lines, Steering Pump Mounting, Steering System & Related Parts, Steering Wheel & Horn Parts, Strut Assembly/Front, Suspension/Front) | Fuel System, Exhaust, Emission System (Accelerator Control, Air Intake System, Cruise Control, E.G.R. Valve & Related Parts, Exhaust System, Fuel Injector Rail, Fuel Supply System, Fuel Tank And Mounting, Fuel Tank Sender, Oxygen Sensors & Related Parts, P.C.M. Module & Wiring Harness, Throttle Body, Vapor Canister Lines & Valve) | Interior Trim, Front Seat Trim, Seat Belts (Inflatable Restraint System, Seat Assembly/Front, Seat Belts, Trim/Front & Roof Headliner, Trim/Front Door, Trim/Quarter) | Maintenance Parts, Fluids, Capacities, Electrical Connectors (Normal Maintenance Replacement Parts) | Rear Glass, Seat Parts, Adjuster (Adjuster Assembly/Power Driver Seat, Adjuster Assembly/Power Passenger Seat, Lamps/Interior) | Rear Seat Trim, Carpet (Carpet/Floor, Compartment Trim/Rear, Seat Assembly/Rear, Trim/Back Window Shelf) | Starter, Generator, Ignition, Electrical, Lamps (Battery Cables & Mounting, Coil & Module/Ignition, Convenience Center Under Seat, Generator Assembly, Generator Mounting, Lamps/Front, Lamps/Rear, Relays, Starter Motor, Starter Motor And Mounting, Wiring Harness Locator) | Transmission - Automatic (Automatic Transmission Case & Related Parts, Automatic Transmission Case, Drive Link, 4th Clutch & Accum, Automatic Transmission Channel Plate, Automatic Transmission Control Valve Assembly, Automatic Transmission Internal Power Train Parts, Automatic Transmission Manual Linkage & Park Components, Automatic Transmission Oil Pump, Shift Control, Transmission Cooler Pipes & Indicator) | Windshield, Wiper, Mirrors, Instrument Panel, Console, Doors (Console/Floor, Door Hardware/Front, Entry System/Keyless Remote, Instrument Panel, Mirror/Rear View-Exterior, Module Assembly/Door Front, Roof Console, Windshield Trim & Hardware, Wiper Motor/Windshield, Wiper System/Windshield)