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Yes, the D-pillar is thicker on one side compared with the other. I don't know for sure, but I imagine this is where the air supply duct runs for the overhead air vents. They have to get that air up there somehow, and none of the other pillars are thick enough for that in my opinion. The rear HVAC unit probably sits in one of the rear corners, which would be the source for the supply line.
Makes sense to me.
 
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