The local museum who hosts our Chapter 16 has a D4 being parted out. I read the serial number as 9U 4180 but looking in the "book", it must be a 7U series or 1948. I am a 1948 series also but being an only child, only one of me was ever built. I digress!
The main spring, main motor head, and fuel tank is missing. The track rails are pretty bad. The spockets are weld ons but pretty far gone. I can take a picture if anyone is interested. I have no idea how much demand there is for parts for this age tractor but i thought I would post it here. We're using the head to bring back to life a 955C also owned by the museum.