[ini]

Any of the older 2 button flip keys should work.

Make sure to get one with the correct frequency (USA or European).

4D0 837 231
4D0 837 231 A
4D0 837 231 B
4D0 837 231 N
4D0 837 231 R

It is more economical to get a £25 remote locking kit from ebay

Mercedes BMW VW Audi Seat Skoda Ford Opel Porsche ke60w on eBay, also Car Alarms Immobilisers, Security Electrical, Car Accessories, Cars, Parts Vehicles (end time 07-Feb-08 23:05:35 GMT)

Remote Keyless Entry for car central lock UNIVERS KE68B on eBay, also Car Alarms Immobilisers, Security Electrical, Car Accessories, Cars, Parts Vehicles (end time 11-Feb-08 22:56:45 GMT)

Remote Keyless Entry for car central lock UNIVERS KE60B on eBay, also Car Alarms Immobilisers, Security Electrical, Car Accessories, Cars, Parts Vehicles (end time 10-Feb-08 21:43:03 GMT)