I've got the 84"X51" on order. IIRC, either the 72" or 84" will work just fine for the 80 series. I just figured I'd make the most use of all the real estate on top of the roof by going with the 84" long one. Very stoked to get this thing installed. It is pricey no doubt especially when adding some of the accessories, but it was love at first sight for me when I saw this rack. Very clean looking with simple lines while maintaining a low profile to be able to still pull the 80 into the garage when it's bedtime for the LC

. Plan to keep my 80 series for a long time so this was a buy once cry once justification for me. Shouldn't have any problems with opening the sunroof. Gonna try to go without the rails on mine to keep as low profile as possible since being able to still pull the LC into the garage is a high priority for me.