Ok my camera has died so you will need to wait for images. The top of my seat back is level with the base of the angle iron that runs behind the drivers head, the measurement from the bottom of the seat hook that mounts to the bulkhead to the bottom of the angle iron is 130mm, the outer most hook is almost touching the armour square mounting plate (you could get a fag paper in between)
I will try and get some older images.
