As others have suggested the original seats on the 86/88/107/109 S1 were a wooden frame with tabs that fit through the holes in the back of seat box, in front of the transom. They were a somewhat failed design with only hessian supporting the Dunlopillo rubber cushions and they usually haven't survived the 55 years since manufacture.
A good solution is to make the frame to the original pattern and stretch some hessian over the frame then top it off with a square of marine ply. That way the ply supports the cushion and makes the frame rigid and from underneath it looks original.
The pattern is on the Series One Garage as Garry has mentioned.
Diana


They don't sell the retrim kits.
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