Hello, it depend son what tractor but look by the stickshift first if it is a smaller one it should be there. It should say tractor no c55543 etc. Well if it says C then it is an allis c if it says wd it is a wd etc. If it is not there look on the block it should be in that area somewhere. Same goes for the letters. The rest of the numbers are the serial #'s and if you look them up on this page it will tell u what ur it was made.