I got the Mazda's. They do raise the truck about 4 inches, only problem being that they are a little wide and will have to be placed in there shifted all the way to the center of the truck and front. You really need to play with them to get them in the right place. If you don't place them that way you will get rubbing either to the tire or the rear right stabilizer bar base. You also have to be careful they don't rub against the brake line when compressed because they are wider than the base and also against the gas tank. They do ride smooth and offer a good height. I left out the rubber on top and bottom of the springs and secured the spings to the bottom and top plate with brackets I got from my construction site. They are curved metals with a screw on the side. If I had not paid for them, I would try another spring that was not as wide. They do allow for a full 4 to 5 inches on down travel. I tried getting the guys that installed them to give me information on what they did, but no one answered the post.