Fixed Seats
The seats in my pre-lit Westfield Seven, my Marlin Roadster and the Moss Monaco I'm building now were/are a one piece plywood inverted U shaped back resting over the tunnel and plywood squabs, all with 3" foam secured by stretching faux leather vinyl over and stapling it to the back of the ply. They weren't/aren't secured at all other than having strips of angle attached to the floor to stop the squabs from sliding forwards. Not a problem through multiple MOTs.
Regards, Mick
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