Never heard or seen these trucks have plates with those numbers affixed to the dash. Maybe it was a "fleet" number???
You can find the serial number in three places. There should be a stamped plated affixed on the inside of the glove box door. The other plate is affixed with rivets in the upper right hand corner of the cowl in the engine compartment. The thierd spot is a stamping on the right frame rail near the front straight axle.
None of the numbers mean too much, to me, especially the "T" numbers. The firewall stampings seem to be missing a few characters from what we would consider normal. Do you know if the trucks are US or some other countries production? Are they right hand drive?
WE NEED PICTURES!!!!! RHD trucks are obviously "rare" to us in the states. From what I remember, trucks for sale in Australia were made in Canada. I just looked through the only Australian Ford truck brochure that I have (1952), but it doesn't mention anything about the model designations.
We don't get too many Australian Ford truck around here. That's why not much info.
Pretty sure all the aussie delivered trucks came from Canada and we had a wider box on the back, skinnier fenders (guards) Pictures will be the best way to identify what you have. Welcome to FTE BTW. John