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When replacing an original seat and there is not a flat surface for your new seat to mount to then a Freedman new seat pedestal is required. All of our high back seats require a flat surface to mount. Seat pedestals come with a fixed top, tilt top and rotating top. All models adjust in height. We also carry an adaptor plate used with high back seats in Grumman Olson only. If you converting from a tubular frame seat with a built in pedestal our adapter plate with a flat top surface is needed. The square shaft will fit into your existing floor pedestal mount on your Grumman.