The "Convertible" rear seat was standard prior to Elan, the seat back & bottom were hinged together with special hinges. The seat bottom would be lifted up & over custom stainless grab rails that doubled as supports for the sundeck. As the seat bottom is lifted up a "kickstand" is pivoted out and sets into a cup in the floor which then supports the center of the seat assembly. (I think I still have some of the custom stainless side rail/supports) The seat bottom also had a pull out center section that saved the upholstery from foot traffic entering the boat. There were several unique componets that made this up, it was complicated but was also the only rear seat that converted into a large sundeck using the entire back & bottom cushion for the deck. If you want send me several close-up pics of what you have so I can try to determine what they did & what you need to complete it....RonT