M45 photos are hard enough to come by as it is. I had assumed all had the muffler, due to the prototype photos and lack of photos from other than the front or side.
Then Pierantonio Farina posted the interesting M45 assembly line photo:
Another Holy Grail of M45 photos would be one of the gun mount between the turret and the gun shield. Every photo that's in the correct viewing position was taken of an M45 with mantlet canvas on it. The M45 photos in Korea so far do not have the canvas in use, so i'd prefer to not model the canvas.