I picked up a pair of Scimitar rear seats (following a tip on another thread) and the first fitting looks good. Just placed there for the photo because of the rain (hence poor picture quality). The seat squab will sit lower,at the moment the red marker pen is holding it in place.
The curve of the seat back fits nicely with the shape of the cockpit.
Even the colour isn't too bad, a tan vinyl, as I was thinking of a tan leather and wood interior anyway although it is a bit more Des O'Connor orange than I really wanted.