Unfortunately Ford did not put any latch anchors in the Excursion (we have a 2004), only the tethors. Not sure how they got around it or why they didn't put the $2 hooks between the seats, but they didn't. You'll just have to use the seat belt and try to get it as tight as you can. A good way to get the belt tight is by kneeling in the car seat (or base) and buckling the locked seat belt. When you get off the seat, it will be very tight.