Another SeaBee! Welcome! I spent some time in the SeaBees. I was on Seabee Team 7108 in VietNam in the late 60's early 70's. I see you were a builer, I was a mechanic, CM3 when I left. I too have a 3/4 ton stovebolt, it is a 1951. Good luck finding drums because I don't think they are avaiable anymore. There are many suppliers of stovebolt parts and you can call them and ask if they know anyone who has them. Good Luck!
Rick