This system allows you to easily replace old boat seats with a new leaning post without having to remove the existing pedestals. This leaning post comes with 3-1/2" Magnum Pedestals that fit over your existing 2-7/8" dia. pedestals. Then it adjusts port to starboard from 21" on center to 28-1/2" on center, so it fits in the same location as your old seats. The leaning post features four rod holders, a tufted removable cushion, and dry storage under the cushion. 37-1/2"W x 15-3/4"D x 11"H.