I have an old 1960s aluminum jon-boat. Its twelve feet long. In the center of the boat is an aluminum bench that runs from the left to the right side of the boat. Its about 2 feet wide and the width of the boat long. Previously I had mounted a fixed seat on a piece of plywood, then attached the plywood to this bench. However I'm looking for a simply swivel seat to mount on this bench. Something that I can bolt to a piece of plywood.

Any of you know where I can get a pretty basic swivel seat (either online or at a local store)?

As for fixing up my boat, I've decided to paint the interior with truck bed liner. Already have it stripped and primed. Going to paint the exterior either aqua-marine or metal flake blue.