Attwood Air System 2-3/8″ Adjustable Height Pedestal Boat Seat Mount 278AO3AM-1This Attwood boat seat mount is designed for use with 2-3/8″ pedestals. The added ribs on the mount and positive lock provide excellent strength and stability while out on the water. Easy to mount this boat seat mount features a standard 5″ 4 hole mounting pattern and is for use with adjustable height pedestals.The 278 Air Series is designed specifically for 278 Air models and features a 2-3/8 diameter fit. This size is unique to the Air series and is not interchangeable with 278 Pro components. Please verify your series before ordering to ensure proper fit.Product Features:Air SystemPositive Lock3 TiltAO Helm/Driver Approved