Dynamats

When you had the headliner out did you notice anything on the ceiling above the 3rd row that would accommodate a 7th seat shoulder harness? Hard to tell from the angle of your pics
 
You mean like an anchor point? Mid-section of the roof does not have any anchor point to attach anything if I recall. There are only cross members to reinforce the roof area.
When you had the headliner out did you notice anything on the ceiling above the 3rd row that would accommodate a 7th seat shoulder harness? Hard to tell from the angle of your pics
 
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