There are no A/C vents in it and there was never going to be... That was always a misunderstanding that I remember trying to fight at the time with apparently little success.
The reference to rear A/C in the description was just the same reference all 6/7 seater configurations get and refers to the usual added vents on C pillars as well as the added A/C assembly (fan and controls) inside the right trunk wall.
I'm guessing the floor attachments/carpeting are the real reason it is not offered as a retrofit.
