Yes. They are mild steel. I have a little experience with this as in my youth I wanted the back end of my car higher. The problem you run into is, the springs will sag just a little more over time. 1 inch longer will only get you about 5/8" higher or so. All things being equal, if your front end is stock, it may be time for a spring replacement. But you can add another few inches to the shackle bars if you want to try it. It WILL work for awhile.
Some of the hot rod shops sell longer ones.
