do you have a pic its deluxe seats im fitting
Use of the Deluxe seats implies the frame is adjustable, in that it can be moved backwards and forwards.
The picture shows the frame
in which the cushion sits. A similar frame is used with the standard seat cushions, when an adjustable seat was specified.
Here, there is no retaining strap, that was used with the non-adjustable seat assembly.
I'm not familiar with the Exmoor Trim cushions, so I'm making an assumption they are replacements for worn out LR DeLuxe cushions, rather than an Exmoor product to upgrade standard LR seating.
Ooops, just re-read your Post 6, you have non adjustable seats.
I THINK there are two options.
Seek a second-hand set of adjustable frames and sliders, but make sure these will fit your cushions, as while the frames for standard cushions are a different part number - 331466, I'm not sure if they have different internal dimensions
Buy a leather strap,
Exmoor suggest you need the 140 mm length, and attach this to the seat base cushion, as though it was a standard cushion. Does the seat box still have the stud the strap fastens to? I suggest asking Exmoor if this is a viable option.
HTH
