Kelvin,

With the serial number the Raymond dealer can tell you exactly what came on the truck. If that will not work you should be able to have someone find the part numbers by the size of the wheel. For load wheels you will need the O.D., Width, bore depth, bore O.D. For the drive tire you will need O.D., Width and I.D. should be a press on tire. The most common drive tire for these trucks is the 632-131/001. If I had to guess on the load wheels it should be one of these 3 632-032/001, 632-043/001 or 632-052/001 which are the most popular and Stam is correct on the caster wheel