You may want to try SAIL2000. They have what is called Stern Perch Seats. I have a set for my C-27 with a split backstay and they are great for added room in the cockpit. They simply mount to the stern rail and have a leg for support.Their website is www.sail2000.com. They may either have them already available or give you instructions as to how to develop a pattern for them. I suppose if you really had to, you could develop a pattern and cut them from KING STARBOARD and mount them yourself.Hope this helps.Mike BeaujeanTimeless Flight1983 C-27