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I am having a similar problem on my 06 325 xi with the left lamp. From talking to a mechanic friend who use to work on VW he said that the buld sensing systems are looking at a voltage across any given circuit. If the voltage changes, the system thinks that a bulb is burned out. This can be caused by corrosion on the contact terminals. I have not been able to chase mine down yet.
The different bulb listings are probably from different bulbs being used in different models or packages. Manufacturers often list them all to be safe.
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