This box will bolt-in place of the factory front box and give you the factory ride height position and 3 additional positions in lowered ride heights. The bottom hole is the factory pivot hole- this means that there is 3" of movement available in the lowering position. The bolt holes are on 1" center lines, the bolts are 5/8", center pin are included, flush mount style rocker pivots are included, anti- rotation pins are included, rod ends with reducers are included, all proper hardware is included, and these assemblies are pre-assembled in house to verify spring spacing. Couple these with the OBS slider mount bracket with the corresponding height positions to make ride height adjustable without changing the pinion angle.