Just to keep you updated,
The lights are on back order until mid December but I have managed to get three units off Ebay, they are the same Cibie units that Jon put pictures of from an american site above.
They use H4 bulbs so I'll have all four with high/low beams and side light bulbs although I expect to use only two as headlights and two as sidelights.
The part number for the units is Cibie/Valeo 082 402 and might be available (in stock) from other suppliers closer to yourselfs.
They fit inside the boxes so as Jon said the boxes will need some adjustment to give them a proper fitted look but not a lot of work and at £33 each i think for me its worth it.
Po.