The seat suspension was purchased from Northern Tool.. The site for the seat suspension has been moved on the Northern site, the one I have lists for $96. They have several. I really wanted a Glyde Ryde, but couldn't justify the cost. A fellow DWF member had these in his boat, and they are working out great. It is one heavy duty unit. It is made for a tractor, all I did was remove the cushions it came with and bolted my Crestliner seat to it. I did have to drill some new mounting holes. I also had to cut 6" off the pedestal and I added a piece of aluminum diamond plate to the floor for support.