I"m sure there were others, but I know that Brockway used the 363 in some of their smaller trucks. There are probably still a few around. I hope you leave the 4-71 in the truck. They make a lot of noise and they are messy, but they are also very good engines, and will draw a crowd every time you start it up. A 4-71 powered Diamond T has to be a very rare thing.