Hello Hanno
Something looks wrong with that light. It looks like it is inside out.
Those lights are really hard to find now. Brian Asbury use to have them NOS.
The wipers are even harder to find. E-bay is most likely the best chance or G503. The proper wiper will not be cheap. Dirk Leegwater had some brackets and arms at one point for them.
The WD number can be a roll of the dice. When they were assembled in the UK they were initially assigned a CMD number. They might have sat there for a short while before being assigned to a unit. Only once assigned to a unit were they given a WD number. They just took what they had and assigned it. i.e. 4 cars 5cwt to Black Watch of Canada. Then they assigned 5 WD numbers in sequence.
Most of my research was in house looking at actual documents or Microfiche. The Microfiche is now on line.
Thanks
Eric
