Review on 🔧 Readylift 66-2094 4-Inch Rear Block Kit - Ford Super Duty (1-Piece Drive Shaft Only), Silver - 1999-2010 by Chris Hazzard

They fit perfectly. Some reviewers say you should shorten the U-arms, but don't. Put a jack under the rear bumper and jack up the side where you do it, there's plenty of room to work underneath. Tires don't need to be removed either. Using a 24mm impact wrench, remove the old U-bolts. Take out the old blocks, put the new ones in the same way as the old ones, along with the new U-bolts. Lower the jack and repeat the process. Now I see that when there is a lot of rust to deal with, it takes longer. Took me an hour to get it ready and then I walked down the street, oh happy day.