Hi Guys,
Here is a picture of said DAC Mk1 drivers seat. The later Mk2 seat had a simple web backrest attached to the roof with straps and a couple of hooks.
As you can see the seat Michael shows is reversed to the DAC seat. The handle for height adjustment is on the front with the DAC seat. Not sure if you could slide the seat from the frame and turn it around. Michael will surely let us know.
Cheers,