Seat Pedestal Manual Adjustable 14" to 20" | West Marine
Amazon.com : Boat Seat Pedestals and Bases Boat Pedestal Seat with Slide Swivel and Height Adjustments for Marine Boat Seats Captain Chair Fishing Seats 13.5 Inch to 18 Inch Height Adjustable Base :
Springfield Plug-In 2-3/8" Removable Pedestals - Marine General