OEM parts categories for 1999 Audi A4 Quattro: A/C & Heating (A/C & Heater Control Units, A/C Condenser Fan, A/C Condenser, Compressor & Lines, A/C Evaporator & Heater Components, Air Conditioner, Automatic Temperature Controls, Blower Motor & Fan, Heater Core & Control Valve, HVAC Case, Switches & Sensors) | Air & Fuel Delivery (Air Inlet Controls, Air Intake, Cruise Control System, Fuel Injection, Fuel Supply, Fuel System Components, Intake Manifold, Intercooler, Throttle Body, Turbocharger) | Belts & Cooling (Belts & Pulleys, Cooling System, Radiator, Water Pump, Cooling Fan, Intercooler, Radiator & Components, Water Pump) | Body & Hardware (Back Glass, Reveal Moldings, Cowl, Ducts, Fender & Components, Exterior Trim, Floor & Rails, Uniside, Front Bumper, Front Console, Rear Console, Front Door, Front Door Glass & Hardware, Lock & Hardware, Front Seat Components, Gate & Hardware, Grille & Components, Hood & Components, Hood & Components, Information Labels, Inner Structure - Quarter Panel, Instrument Panel, Lift Gate - Wiper & Washer Components, Outside Mirrors, Quarter Panel & Components, Glass, Radiator Support, Rear Body Panel, Floor & Rails, Rear Bumper, Rear Door, Rear Door Glass & Hardware, Lock & Hardware, Rear Seat Components, Roof & Components, Exterior Trim, Seat Belt, Sound System, Splash Shields, Structural Components & Rails, Sunroof, Trunk, Windshield - Wiper & Washer Components, Windshield Glass, Reveal Moldings) | Brakes (Anti-Lock Brakes, Brake Components, Front Brakes, Hydraulic System, Parking Brake, Rear Brakes) | Charging & Starting (Alternator, Battery, Starter) | Driveline & Axles (Front Axle Shafts & Joints, Drive Axles, Rear Axle, Axle Shafts & Joints, Differential, Drive Axles, Propeller Shaft) | Electrical (ABS Components, Air Bag Components, Alarm System, Antenna & Radio, Anti-Theft Components, Cruise Control System, Door & Components, Front Door, Front Seat Belts, Fuel Door, Fuse & Relay, Heated Seats, Horn, Ignition Lock, Ignition System, Instruments & Gauges, Mirrors, Power Seats, Powertrain Control, Rear Door, Rear Seat Belts, Senders, Starter, Sunroof, Switches, Trunk, Washer Components, Wiper & Washer Components) | Emission Control & Exhaust (EGR System, Emission Components, Exhaust Components, Exhaust Manifold) | Engine (Engine & Trans Mounting, Engine Appearance Cover, Engine Parts, Mounts, Cylinder Head & Valves, Camshaft & Timing, Variable Valve Timing, Oil Cooler, Oil Pan, Oil Pump, Crankshaft & Bearings, Pistons, Rings & Bearings, Transaxle Parts, Turbocharger) | Headlights & Lighting (Bulbs, Fog Lamps, Headlamps, Headlamp Washers/Wipers, High Mount Lamps, License Lamps, Side Repeater Lamps, Signal Lamps, Tail Lamps) | Interior & Exterior Trim (Exterior Trim - Front Door, Exterior Trim - Lift Gate, Exterior Trim - Pillars, Rocker & Floor, Exterior Trim - Rear Door, Fender & Components, Exterior Trim, Interior Trim - Front Door, Interior Trim - Lift Gate, Interior Trim - Pillars, Rocker & Floor, Interior Trim - Quarter Panels, Interior Trim - Rear Body, Interior Trim - Rear Door, Interior Trim - Roof, Roof & Components, Exterior Trim, Trunk Lid & Components, Exterior Trim) | Maintenance & Lubrication (Automatic Transmission, Belts & Pulleys, Filters) | Steering (P/S Pump & Hoses, Steering Gear & Linkage, Steering Column & Wheel, Steering Gear & Linkage, Shroud, Switches & Levers) | Suspension (Axle & Differential - Rear, Drive Axles - Front, Drive Axles - Rear, Front Suspension Components, Lower Control Arm, Stabilizer Bar, Rear Axle, Lower Control Arm, Upper Control Arm, Stabilizer Bar, Suspension Components, Rear Suspension, Stabilizer Bar & Components - Front, Stabilizer Bar & Components - Rear, Struts & Components - Front, Wheels) | Transmission (Automatic Transmission, Clutch & Flywheel, Gear Shift Control - AT, Gear Shift Control - MT, Hydraulic System, Manual Transmission)