Our Camburg spring-under bump stop mounts bolt onto the rear of your 2007-2021 Toyota Tundra with ease. These are designed to use FOX 2.0 x 2.5" or 2.0 x 4" hydraulic bump stops with Deaver I-96 spring-under leaf springs or the equivalent. These are NOT for the factory leaf spring setup. They provide additional bottom out control to maximize the vehicles entire suspension travel. They are MIG welded, powder coated wrinkle black and include all the necessary Grade 8 hardware. These bolt into existing holes in the frame once the factory bump stop mounts are removed, so their is no guess work on placement or drilling needed. We recommend the 2.5" travel bump stop for lower ride heights which is the most common and the 4" travel bump stop for taller ride heights and race applications.