The bracing that you are looking at from what I understand is for those vehicles that have the panoramic roof for stiffness. This is the same bracing that is used for those that would like to install a hitch on their vehicle. I currently have a S drive w/o the panoramic roof and in order to attach a curt hitch, I have to install those braces and a A frame underneath. I have identified all the components and hopefully if not too expensive I will retrofit my car and install the hitch myself. Just don't look down.
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