Kubota serial number locations: B SERIES Models B5100, B5200, B6000, B6100, B6200, B7100, B7200, and B8200 L SERIES Models L175, L185, L225, L235, L245, L275, L285, L305, L345, L355, L2250, L2550, L2850, L3350, L3750, and L4150 M SERIES Models M4000, M4050, M4500, M4900, M5500, M5950, M6950, M7950, and M8950 Serial number plate is located either on the right or left side of transmission case, on forward end (could also be stamped into the transmission case). Engine serial number, in all cases, is located on right side of engine adjacent to fuel injection pump flange on engines that use an in-line fuel pump. On engines that use a rotary pump, the serial number plate is stamped into left side of block. UTILITY VEHICLES Located on the left side above the battery under dump bed.