5th Gen holder on the left, 5.5 Gen holder on the right. You can see the slight size difference that will require you to cut some of the headliner when installing the 5.5 Gen holder into a 5th Gen. You will need to cut about 1/2 inch from the windshield side of the opening and possibly 1/4 inch from both sides. I cut the sides without test fitting first to see if I really needed to cut.
