OEM parts categories for 1990 Chevrolet G20: Body Mounting, Air Conditioning, Audio/Entertainment (A/C & Heater Control Assembly, A/C & Heater Module Assembly, A/C & Heater Module Assembly/Rear Air, A/C Compressor Assembly, A/C Compressor Mounting, A/C Control System/Vacuum & Electrical, A/C Refrigeration System, A/C System/Rear, Air Distribution System/Instrument Panel, Air Distribution System/Plenum, Audio System & Antenna, Cluster Assembly/Instrument Panel) | Brakes (Brake Booster/Vacuum, Brake Caliper/Front, Brake Master Cylinder, Brake System, Parking Brake System, Wheel Cylinder/Drum Brake Rear Wheel) | Brakes, Rear Axle, Propeller Shaft, Wheels, Tires (Axle Assembly/Rear, Brake Assembly/Rear Drum, Differential/Locking, Prop Shaft, Vibration Dampener/Drive Line, Wheels & Wheel Covers) | Cab And Body Structure, Mirrors, Doors, Trim, Seat Belts, Wipers (Door Hardware & Trim, Door Hardware/Rear, Door Hardware/Side Rear, Door Hardware/Side Rear Sliding, Door Hardware/Side Rear Swingout, Door Trim/Rear, Door Trim/Side Rear Swing Out, Door Trim/Side Rear/Sliding Door, Engine Cover & Related Parts, Engine Cover & Related Parts/Sheet Metal, Floor Covering & Related Parts Flooring & Step Wells, Floor Covering & Sill Plates, Instrument Panel & Related Parts, Insulators/Dash Panel, Insulators/Floor, Insulators/Floor & Rear Wheel Housing, Lamp/Dome & Reading, Mirror/Inside Rear View & Sunshades, Mirror/Outside Rear View, Power Window & Door Lock System, Rear Seat/1st & 2nd Bench, Seat Belts & Related Parts, Seat/Bucket, Seat/Travel Bed, Sheet Metal/Body Side, Sheet Metal/Roof, Trim/Interior Side, Trim/Interior-Roof, Vent Window/Front Door, Windows/Glass, Windshield & Windows/Body Side, Wiper System/Windshield) | Cooling System, Grille, Oil System (Engine Oil Cooler, Engine Oil Pressure & Temperature Switches, Grille/Radiator, Pulleys & Belts, Pulleys & Belts/Accessory Drive, Radiator Assembly, Radiator Mounting & Related Parts) | Engine (Engine & Transmission Mounting, Engine Assembly & Partial Engine) | Frames, Springs, Shocks, Bumpers, Fascias (Bumper/Rear, Spare Wheel Carrier, Suspension/Rear, Trailer Hitch) | Front Axle, Front Suspension, Steering (Steering Column/Tilt Wheel, Steering Gear Assembly, Steering Linkage, Steering Pump Assembly, Steering Pump Assembly/Brake Pump Assembly, Steering Pump Mounting & Lines, Steering System & Related Parts, Steering Wheel & Horn Parts, Steering/Brake Pump Mounting & Lines, Suspension/Front) | Front End Sheet Metal, Heater (Heater & Defroster System & Blower Details, Heater Assembly Rear Auxiliary, Heater Control Assembly, Heater System/Rear, Jack & Tool Stowage, Sheet Metal/Front End) | Fuel System, Exhaust, Emission System (A.I.R. Control Valve & Related Parts, A.I.R. Pump & Related Parts, Accelerator Control Engine Compartment, Accelerator Pedal & Rod, Air Intake System, Cruise Control, E.C.M. Module & Wiring Harness, E.G.R. Valve & Vent Tubes, Emission Controls Actuator, Valve & Harness, Exhaust System, Fuel Filter, Fuel Injection System, Fuel Tank & Supply, Heat Shields/Exhaust, Injection Pump/Fuel, T.B.I. & Related Parts, Throttle Body & Sensors, Throttle Body Injection, Vacuum Pump & Related Parts, Vapor Canister & Related Parts) | Rear Body Structure, Moldings & Trim, Cargo Stowage (Decals & Nameplates/Endgate, Moldings/Body) | Starter, Generator, Ignition, Electrical, Lamps (Distributor/Ignition, Generator Assembly, Generator Mounting, Headlamps-Single, Headlamps/Dual, Lamps/Rear, Spark Plug Wiring, Starter Motor) | Transmission - Automatic (Automatic Transmission Auxiliary Accumulator Valve, Automatic Transmission Case & Related Parts, Automatic Transmission Clutch Gears, Automatic Transmission Control Valve, Automatic Transmission Oil Pump, Automatic Transmission Parking Lock Linkage, Shift Control)