The OEM suppliers are (not exhaustive, changes frequently):
   ATE                    Brake components (master cylinder)
   BBS                    Rims, some cars, not restamped
   Beru                   Electrical components (rotor, cap)
   Boge                   Shocks & components
   Boka                   Waterpump, Mexican made VWs
   Bosch                  Many of the electronic components (e.g. Alternator)
                          Fuel, other filters, FI, antenna
   Continental            Drive Belts, Tires (note, they also make Uniroyal
   			  Semperit, Gislaved and General Tires)
   FAG                    Brake components, master cylinders, wheel bearings
   Fichtel & Sachs        Clutches, shocks on some cars
   Fuba                   Roof mounted antenna (flexible one)
   Gillet                 Exhaust (at least at some point)
   Girling                Front disc brakes < 81, F&R on Passat >8?, 
   			  Rear 16V GTIs
   Glazurit/Hoechst/BASF  Brand of paint used.
                          Unclear who produces water based paints in newer VWs
   Golde		  Sunroof Maker
   Hella                  Lights, markers, bulbs
   Hengst                 Oil filters VR6
   Hirschmann             Antennas, some VWs
   Keiper/Recaro          Makers of VW Seats (not *real* Recaros)
   Kesley-Hayes           Front Brake calipers most > 81 cars
   Leistritz              Exhaust (for some--usually VR6 cars)
   Loebro                 CV Joints
   M.A.N.N.               Oil & Air Filters
   Matsushita             Heidelberg (VI & others) radios.
   Motorola               Alternator in some US made cars
   Recaro                 Seats, some cars, not restamped
   Ronal                  Alloy rims some Audis/VWs
   Sekurit                Windshield, windows
   Sofica                 Radiators, Heater cores (French), prone to leaks
   TRW                    Power steering pumps
   Teves                  Rear disc brakes (GTIs, GLIs, Corrado)
                          Note: ATE = Albert Teves, div IT+T
   VDO,MotoMeter          Gauges
   Wahler                 Thermostats
Оригинал лежит по адресу 
http://www.faqs.org/faqs/autos/vw/general-faq/