I installed a cheap set of dampers and springs and found that they hit very hard. It was the wrong caster angle that was pushing the impact force onto the frame, not the damper. Installing these mounts completely eliminated that hard hit and reduced the number of "brake dips" experienced. Choose these brackets over two-piece designs. Strong and durable, and Rancho's lifetime warranty can't be beat. Installation was easy. You don't have to lift the axle to insert it. With a crowbar and punch, it's a bit of a hassle to align the bolts, but if you install one side at a time, the second fits like a dream.