You had to cut holes to mount the rear seat headrests and also to attach the seat belts. The instructions for the 2020 Highlander don't seem right, especially with a 60/40 fit. The instructions show that there must be zippers for the 60/40 folding rear seats, but there are no such zippers. I'll leave it for the front seats, but I'll most likely ditch the covers on the back seat. Such a waste.