They fit my 2008 Nissan Frontier Crew Cab perfectly. My friend and I installed them in half a day. Use a jigsaw to remove the standard "bumpers" between the leaf springs and the frame. They look like rubber but are reinforced with metal. We also cut some of the bracket bolts and drilled holes in the bumper for the valves. Everything looks clean and works great. I use them to reinforce the rear end when towing my food truck to prevent sagging. They work great and the installation wasn't bad at all.