Springfield Camlock Slider - $113.99

Multiple adjustment options let you position the seat for optimal comfort. This mount rotates 360 , automatically locks forward for safety, and has a 6" fore and aft adjustable travel range. A single dual-function activator handle controls the movement functions. Pull it up on the right side to rotate, pull the same handle on the left side to slide fore or aft. Sizes: 2-3/8" post or 2-7/8" post. - $113.99