That's not a single part number.
If you want the gear and shaft, you will need:
02A409193 guide/bushing for pinion and/or
02A409197 speedometer pinion and
Are you having trouble with the drive shaft/gear instead of the transmitter?
The part I listed earlier is for the Hall effect sender that is driven by the gear/shaft within the transmission. They are not joined in a single piece, so the sender looks like a little stub. Again, I urge you to check the function of the sender with a meter before throwing parts at the problem. Sometimes the senders go, sometimes the drive shafts, and sometimes wiring is the problem.