1st let's check your e53. What's the last 7 of your ViN say? Try mdecoder.com as it seems to have the easiest interface to pull all your options from the factory. Then we can go from there.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course