Hi 1515
If they are Marchal I’m guessing that they will be 1 x 660 model and 1 x 660/760 model – the only difference being the layout of the prisms in the glass. They are often available on Ebay, believe it or not but they are never cheap! I managed to buy a French spotlight for the windscreen pillar and I also have an American one which is almost identical (a leftover from one of the WWII militarys I used to own) but I’m now in two minds about drilling a hole through the pillar.
Larry have you a picture of yours? It might persuade me one way or the other…..