Rear seats???

[PiersLB]

I have a 1969 XK150 FHC. Somewhere along the line the rear seats were removed and thrown away (whoa???). all the upholsterers I have spoken to can re-trim a seat, but don't know the basic pattern from which to make it.

Does anyone know either where I might find the pattern or could anyone lend me a seat and back for a day to take to a recognized upholster to make a pattern from? Any information much appreciated!

Thanks,
Piers