This is the large belt that is attached to the clutch that the lock connector is pushed into. This belt is a lot easier to replace than the 3000a motor belt as the 4600 series motors do not have to be dismantled.  The Passap 4600 motor toothed drive belt is not the same size or length as the 3000a belt. They are not interchangeable. 

Passap part number is 12.530.02