Thanks for your reply. It seems that the W202 uses a gear box/transmission to transfer power from the motor to the seat cushion, and not a driveshaft/speedometer cable.

Now, all I really need is a replacement gear box/transmission for the driver's seat and I should be back in business. Can anyone let me know whether the gear box/transmission is available as a separate part and where can I find such a part?

Please let me know. Thanks.