Wow, you're pulling these dump trucks out of the woodwork! Congrats on the new one. What year is it?
Please post more photos when you have the chance. In particular, I'd like to see how the PTO driveshaft support bearing is mounted to the chassis and also a nice shot of the nomenclature data tag and shift diagram would be much appreciated. Also, if it has the lower inside engine splash guards (that mount between the chassis and the oil pan on each side of the engine) I'm certain everyone would love to see what those look like.
Original mirror arm for a late-war GPWG-506
Original pillow bearing for dump truck PTO driveshaft: