I have a New Holland GT20 water-cooled Kawasaki powered garden tractor. The engine model is FD620D-xxxx. I am trying to find out what the xxxx spec# is. The sticker is long gone on the crankcase cover on the front of the engine. The only engine information I have is on the air cleaner housing. FD620D:Manufacture date 2/98. The garden tractors serial # is T8AB0294 with a component #716498006. I would appreciate it greatly if someone could help.