Boat Seat Accessories Swivel Mount Post Pedestal Pin Base Slide Spring Rise Part | eBay
Amazon.com: Boat Seat Base 7" x 7" Aluminum Alloy Material 3/4" Pin Socket, Heavy Duty Boat Seat Pedestals, Base Corrosion Resistant, High Durability, Easy Installation, Suitable for Most Boat Seats : Sports
Amazon.com : MATINA Boat Seat Base, 7" x 7" Aluminum Boat Seat Pedestal & Base with 3/4" Pin Post Socket, Heavy Duty Boat Accessories for Boat Seat Post & Boat Seat Mount