bumming round the net, looks like someone has had a try to see what it would look like,
i was talking to chas about it the other day, the possiblity of a limited run or clear tailights, not white as i guess the shade would have to be spot on to allow enough light through, the mrs is off to india at the end of the year, and she's gonna speak to a friend out there who does plastics manufacture to get an idea of the costs involved in reverse engineering a clear polycarbonate tail light cover
of course that would only be a first step as the actual holder would need to be modified and repainted to make it look ok...still worth a try