OEM parts categories for 2004 Chevrolet Impala: Body Moldings, Sheet Metal, Rear Compartment Hardware, Roof Hardware (Decals/Body, Moldings/Body-Above Belt, Moldings/Body-Below Belt, Ornamentation/Body, Rear Compartment Hardware, Sheet Metal/Body-Engine Compartment & Dash, Sheet Metal/Body-Rear End, Sheet Metal/Body-Side Frame, Door & Roof, Sheet Metal/Body-Underbody, Spoiler/Rear Compartment Lid, Sunroof) | Body Mounting, Air Conditioning, Audio/Entertainment (A/C & Heater Control Assembly, A/C & Heater Module Assembly, A/C Compressor Assembly, A/C Compressor Mounting, A/C Refrigeration System, Air Distribution System, Antenna, Antenna/Digital Audio, Audio System, Body Mounting, Communication System "Onstar", Lamp/Spotlight, Radio Assembly & Mounting, Sensor/Temperature) | Body Wiring, Roof Trim (Wiring Harness/Body) | Brakes (Brake Booster, Brake Caliper/Front, Brake Caliper/Rear, Brake Electrical System, Brake Lines, Brake Master Cylinder, Brake Pedal & Master Cylinder Mounting, Brake Pressure Modulator Valve, Parking Brake Assembly, Parking Brake System) | Brakes, Rear Axle, Propeller Shaft, Wheels, Tires (Wheels & Wheel Covers) | Cooling System, Grille, Oil System (Engine Block Heater, Engine Coolant Fan, Engine Oil Cooler, Grille/Radiator, Hoses & Pipes/Radiator, Pulleys & Belts/Accessory Drive, Radiator Assembly, Radiator Mounting & Related Parts) | Engine (Cover/Transmission Converter, Engine & Transmission Mounting, Engine Assembly-Cylinder Block & Related Parts, Engine Assembly-Cylinder Head & Related Parts, Engine Assembly-Front Cover & Cooling, Engine Assembly-Manifolds & Fuel Related Parts, Engine Assembly-Oil Pump, Oil Pan & Related Parts, Engine To Transmission Mounting) | Frames, Springs, Shocks, Bumpers, Fascias (Bumper/Front, Bumper/Rear, Suspension/Rear) | Front End Sheet Metal, Heater (Fender & Wheelhouse/Front End, Hood, Hoses & Pipes/Heater, Labels, Paint/Touch-Up, Spare Wheel Stowage & Jack Parts) | Front Suspension, Steering (Drive Shaft/Front Wheel, Steering Column, Steering Gear Assembly, 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 Supply System-Fuel Lines, Fuel Tank & Filler Pipe, M.A.P. & Oxygen Sensors, P.C.M. Module & Wiring Harness, Throttle Body, Vapor Canister Lines & Valve) | Interior Trim, Front Seat Trim, Seat Belts (Arm Rest/Front Seat-Storage, Inflatable Restraint System, Roof Headliner, Seat Assembly/Driver, Seat Assembly/Front Driver & Passenger, Seat Assembly/Passenger, Seat Belt Extension, Seat Belts, Seat Belts-Rear, Seat Belts/Front, Trim/Center Pillar & Quarter, Trim/Front Door, Trim/Interior-Front, Trim/Quarter, Trim/Rear Door) | Maintenance Parts, Fluids, Capacities, Electrical Connectors (Normal Maintenance Replacement Parts) | Rear Glass, Seat Parts, Adjuster (Adjuster Assembly/Manual Driver Seat, Adjuster Assembly/Manual Passenger Seat, Adjuster Assembly/Seat, Lamps/Interior, Lamps/Interior-Auxiliary Dome, Quarter Window & Back Glass) | Rear Seat Trim, Carpet (Carpet/Floor, Compartment Trim/Rear, Seat Assembly/Rear Full Bench, Seat Assembly/Rear Split Bench, Trim/Back Window Shelf) | Starter, Generator, Ignition, Electrical, Lamps (Battery Cables, Block/Accessory Wiring Junction, Coil & Module/Ignition, Daytime Running Lamp Components, Engine Electrical, Generator Mounting, Horn, Key & Lock Cylinders, Lamps/Emergency-Shelf Mounted, Lamps/Emergency-Trunk Mounted, Lamps/Front, Lamps/Rear, Relays & Modules, Spark Plug Wiring, Starter Motor And Mounting, Wiring Harness Locator, Wiring/Auxiliary Lamps) | 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 Components, Automatic Transmission Manual Linkage & Park Components, Automatic Transmission Oil Cooler Pipes, Automatic Transmission Oil Pump Assembly, Shift Control, Transaxle To Engine, Transmission Filler Tube) | Windshield, Wiper, Mirrors, Instrument Panel, Console, Doors (Console, Door Hardware/Front, Door Hardware/Rear, Entry System/Keyless Remote, Instrument Panel, Instrument Panel Trim, Instrument Panel/Structure, Mirror/Rear View-Exterior, Module Assembly/Windshield Wiper, Roof Console, Sunshade Assembly Mirror/Sunshade Vanity, Weatherstrips, Windshield Trim & Hardware, Wiper System/Windshield)