Seat bases are (should be) secured by a short leather strap between the front of the seat and the peg on the front of the seat box next to the attachment for the hatches fastener. In addition there should be two wooden battens screwed to the back of the seat cushion that stop it moving sideways as they are a close fit to the rails the seat cushions sit on.
The drivers seat appears to have the optional adjustable frame under it, but this has been butchered to fit the orphan seat you have. The adjustable seat frame has the same back as the standard seat, but a slightly different cushion that sits inside a perimeter frame but is still lift out.
I suggest you get a parts book to see the details. This is, I am pretty certain on the "Rave CD" available from "Shop" at the top of this page (and helps to support this site).
John
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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